ࡱ>  de` Wjbjb '|c|cBCU LB 8bfn\#ooo8pq\#z(sZtttt"# /!######,$RvOb7~^77OTXtt d7:tbt!V z N`47!=Tb5s ;Tmo?r ,5z0LX5f\#\#d$\#\# Mathematics Teaching and Learning Alan H. Schoenfeld Elizabeth and Edward Conner Professor of Education Graduate School of Education University of California Berkeley, CA 94720-1670, USA Email: alans@socrates.berkeley.edu Draft R: March 27, 2005 A draft for the Handbook of Educational Psychology, Second Edition It was the best of times, it was the worst of times, it was the age of wisdom, it was the age of foolishness, it was the epoch of belief, it was the epoch of doubt, it was the season of Light, it was the season of Darkness, it was the spring of hope, it was the winter of despair, we had everything before us, we had nothing before us. Charles Dickens, A Tale of Two Cities Introduction This chapter focuses on advances in the study of mathematics teaching and learning since the publication of the first edition of the Handbook of Educational Psychology (Berliner & Calfee, editors) in 1996. Because of the scope of the review, comprehensive coverage is not possible. In what follows I have chosen to focus thematically on major areas in which progress has been made or where issues at the boundaries of theory and practice are controversial. These areas include: research focusing on issues of teacher knowledge and aspects of professional development; issues of curriculum development, implementation, and assessment; issues of equity and diversity; and issues of learning in context(s). The chapter concludes with a discussion of the state of the field and its contextual surround. To provide the context for what follows, this chapter begins with a brief historical review. The story line starts at the turn of the 20th century, with increasing attention given to more current trends. The topics addressed include demographics, curriculum content, and the philosophical and epistemological underpinnings of curricula, research methods, and findings. Context Part 1. Demographics. Near the turn of the 20th century, elementary education was intended for the masses; secondary education and beyond were reserved for the elite. In 1890, for example, 6.7% of the fourteen year-olds in the United States attended high school; only 3.5% of the seventeen year-olds graduated. Things did not remain this way for long. There were significant changes in enrollment patterns over the course of the century. With them came pressures to adapt the curriculum to the needs of those enrolled in mathematics courses. By the beginning of World War II, almost three-fourths of American children aged 14 to 17 attended high school, and 49% of the 17 year-olds graduated (Stanic, 1987). These demographic trends continued through the end of the century. Currently the expectation that a school child will enroll in college at some point is more the norm than the exception. Demographic shifts over the 20th century resulted in curricular shifts. At the turn of the century, there was a huge gulf between elementary and secondary mathematics curricula. Elementary school mathematics focused largely on arithmetic, to provide basic skills for those citizens about to enter the workforce. Secondary school focused on the mathematics that led to college: high school students studied rigorous courses in algebra, geometry and physics. In the 1909-1910 school year, roughly 57% of the nations high school students studied algebra and more than 31% studied geometry. Only 1.9% studied trigonometry, which was often studied at the college level. Calculus was typically studied in college, often as an upper division course. (Jones & Coxford, 1970, p. 54). As increasing numbers of students made their way into secondary school over the course of the 20th century they confronted mathematics courses that had been constructed for a more selective audience. Ultimately the result was a high failure rate and substantial leakage from the mathematics pipeline as soon as mathematics courses became optional. Estimates are that in the late 20th century, half of the students enrolled in mathematics courses left the mathematics pipeline every year after 9th grade. Disproportionate numbers of these students came from under-represented minority groups. (Madison & Hart, 1990; National Science Foundation, 2000). Part 2. Contested terrain: The social underpinnings of mathematics instruction The goals and purposes of mathematics instruction have been contested through the years. Rosen (2000) argues that there have been three master narratives (or myths) regarding education in America, each of which celebrates a particular set of cultural ideals: education for democratic equality (the story that schools should serve the needs of democracy by promoting equality and providing training for citizenship); education for social efficiency (the story that schools should serve the needs of the social and economic order by training students to occupy different positions in society and the economy); and education for social mobility (the story that schools should serve the needs of individuals by providing the means of gaining advantage in competitions for social mobility). (Rosen, 2000, p. 4) In a related analysis, Stanic (1987) adds two psychological perspectives. He notes that humanists believed in mental discipline, the ability to reason, and the cultural value of mathematics. From this perspective, learning mathematics is a vehicle learning to think logically in general. Developmentalists focused on the alignment of school curricula with the growing mental capacities of children. Beyond the philosophical and psychological differences that influenced mathematics curriculum, testing, and research, there have also been periodic military and/or economic imperatives. In the 1940s it became something of a public scandal that army recruits knew so little math that the army itself had to provide training in the arithmetic needed for basic bookkeeping and gunnery. Admiral Nimitz complained of mathematical deficiencies of would-be officer candidates and navy volunteers. The basic skills of these military personnel should have been learned in the public schools but were not (Klein, 2003). Twenty years later, the new math, which was adopted to various degrees world-wide, was occasioned by the sense of national crisis in the US following the 1957 launch of the Soviet satellite Sputnik. The economic crises of the 1970s occasioned these famous words from A Nation at Risk: If an unfriendly foreign power had attempted to impose on America the mediocre educational performance that exists today, we might well have viewed it as an act of war. As it stands, we have allowed this to happen to ourselves. We have even squandered the gains in student achievement made in the wake of the Sputnik challenge. Moreover, we have dismantled essential support systems which helped make those gains possible. We have, in effect, been committing an act of unthinking, unilateral educational disarmament. (National Commission on Excellence in Education, 1983, p. 1) In addition, the very poor showing of U.S. students on the Second International Mathematics Study (McKnight, Crosswhite, Dossey, Kifer, Swafford, Travers, & Cooney, 1987; McKnight, Travers, Crosswhite, & Swafford, 1985; McKnight, Travers, & Dossey, 1985) set the stage for possible curricular change in the mid-to-late 1980s. Part 3. Psychological and epistemological underpinnings of contemporary research The theory space for education in general, and mathematics education in particular, has varied quite substantially over the past century. In broad-brush terms, the situation was summarized by Greeno, Collins, and Resnick (1996). The authors outlined three main perspectives on knowing: - Knowing as having associations: the behaviorist/empiricist view; - Knowing as having concepts and cognitive abilities: the cognitive/rationalist view; - Knowing as distributed in the world: the situative/pragmatist-sociohistoric view. Each of these is a large umbrella that subsumes a range of perspectives, but with an underlying thematic coherence. In the behaviorist/empiricist view, knowing is seen as possessing an organized collection of elementary mental or behavioral units (Greeno, Collins, and Resnick, 1996, p. 17). The associationists/behaviorists date back to Pavlovs (1928) stimulus-response work with dogs, and Watsons (1930) and Skinners (1938) insistence on a science of behavior that banished ideas of mentalism and allowed only for the recording of observable behaviors. Educational applications focused on developing and strengthening stimulus-response associations. Scholars such as Thorndike (1931) and Gagn (1965) focused on the hierarchical decomposition of complex tasks into collections of smaller tasks, which could then be mastered through practice (repetition of stimulus-response connections). Ironically, the late 20th century adherents of the behaviorist/empiricist view rejected their forebears rejection of the idea of mentalistic processes, and engaged in cognitive modeling the creation of computational models of cognitive phenomena. At the core of the architecture of these models, however, was the notion of memory retrieval as a function of the strength of associative bonds. Thus, the neural network approach to modeling cognition (see, e.g., Rumelhart, McClelland, & PDP research Group, 1986) represents knowing in terms of patterns of spreading activation. At the core of production system models of cognition (see, e.g., Klahr, Langley, & Neches, 1987; Newell, 1990; Newell & Simon, 1972) are condition-action pairs that represent strong associations. Thus there is an emerging scientific base for the modeling of cognitive phenomena along behaviorist/empiricist lines, at the same time that the underlying theoretical perspective has fallen out of favor with regard to instructional implications the educational community at large having given much more attention in recent years to the cognitive and situative perspectives than to that of the behaviorists. In the cognitive view, which began to flourish in the 1970s (see, e.g., Neisser, 1967, as an exemplar of a seminal text; see Gardner, 1985, for an accessible history) knowing is seen as having structures of information and processes that recognize and construct patterns of symbols in order to organize concepts and to exhibit general abilities, such as reasoning, solving problems, and understanding language (Greeno, Collins, and Resnick, 1996, p. 18). In this view, mental actions are seen as being at the core of human thinking and behaving. Humans perceive the world, represent it symbolically, act on those symbols internally, and then act on the world in response. By the late 1980s, there was a strong convergence in mathematics education (and more broadly, in research in other problem solving disciplines) on a uniform framework for representing and understanding aspects of mathematical behavior. Generally speaking (see, e.g., deCorte, Greer, & Verschaffel, 1996; Schoenfeld, 1985, 1992), there is among cognitivists a consensus that an understanding of peoples mathematical performance requires attention to the following aspects of cognition: the knowledge base and how knowledge is represented and organized; knowledge of, access to, and use of problem solving strategies commonly known (after Plya, 1945) as heuristic strategies; monitoring and self-regulation, central aspects of metacognition; beliefs and affect, which include ones sense of the discipline and how it is appropriately practiced, and ones sense of self and how one engages in and with the discipline; practices, a set of behaviors in which members of the (school or mathematical) community routinely engage when doing mathematics. The argument is that these categories of analysis are in some sense necessary and sufficient for examining and explaining mathematical behavior necessary in that if one neglects to look for all of them when examining peoples mathematical behavior, one runs the risk of missing a central explanatory factor, and sufficient in that no additional categories are necessary to span the explanation space. It should be noted that this perspective offers a framework, not a theory. It lacks is a sense of mechanism, a characterization of how all these categories actually interact and function as people are engaged in mathematical behavior. The third perspective on knowing, the situative/pragmatist-sociohistoric view, focuses on the way knowledge is distributed in the world among individuals, the tools artifacts, and books they use, and the communities and practices in which they participate. (Greeno, Collins, and Resnick, 1996, p. 20). In this perspective, one might characterize mathematical competency by the ways one interacts with mathematics and those who do mathematics. Does one go to mathematics conferences, appear to follow complex talks, ask questions and interact over matters of mathematical substance? Is one taken for a mathematician by those at the conference during those interactions? If so, there is a fairly good chance one knows some mathematics/is a mathematician. Knowing, in this view, is sustained participation in practices involving collaboration and use of resources, and learning is becoming more effectively and centrally involved in the practices of the communities. This view was developed in America by Dewey (1910/1978; 1916) and Mead (1934) and in the Soviet Union by Vygotsky (1934/1962) (Greeno, Pearson, & Schoenfeld, 1997, p. 159.) Aspects of mathematical knowing and achievement from the situative perspective include: Basic aspects of participation, readily identifiable individual and communal acts of mathematical inquiry, sense-making, and production; Identity and membership in communities, peoples senses of self and their affiliation with groups of like-minded people. Sense of self includes dispositions (predilections to view the world in particular ways) and feelings of self-confidence, competence, and entitlement/empowerment. Formulating problems and goals and applying standards. The underlying assumption here is that most human activity is goal-oriented aimed at solving some tacit or explicit problems. Constructing meaning. This, specifically, is where domain knowledge comes into play. Fluency with technical methods and representations. It is argued that meaning-making exists in dialectic with the knowledge and skills that comprise the knowledge base. (Greeno, Pearson, & Schoenfeld, 1997, pp. 160-161) A few metatheoretical points should be noted before we turn to the work of the previous decade. As some researchers in mathematics education (and in education and psychology writ large) would have it, behaviorism/associationism is or should be dead and buried; cognitive science had its heyday but is now pass, and sociocultural theory is in ascendance. Others will argue heatedly that sociocultural work is faddish and void of deep intellectual substance. (For one such article, provoked by others, see Anderson, Reder, & Simon, 1996.) As will be discussed later in this review, there are serious costs to the field, internally and externally, to this kind of dispute when it is general (this theory is better than that theory) rather than grounded in specifics. All three perspectives have distinguished intellectual lineages and are vibrantly alive in some ways today. There is no doubting that the study of mental phenomena is alive and well. Some theoretical version of constructivism, on the order of human beings do not perceive reality directly, but instead receive sensory inputs which they interpret is as well substantiated as any scientific theory. Were we to perceive reality directly, after all, optical illusions would be impossible. Thus the behaviorists banishing of mentalism was misguided, and the theoretical limiting of knowing to the presence of associative bonds was inappropriately reductive. Nonetheless, a non-trivial percentage of human activity is skill-based, and the behaviorists empirical work on skill acquisition still stands experimentally. (That is not to say that skills without understanding are desired in mathematics or many arenas. But knowing about skill acquisition and reinforcement is useful). More to the point in contemporary terms, a great deal of cognitive modeling is associationist in spirit and, properly done, scientific in the true sense of being rigorously grounded in theory and accountable to empirical data. There are phenomena that this approach seems well suited to explain or model, and phenomena that are not. When the phenomena are appropriate, then the relevant methods are useful. This point applies as well to the current disjunction in perspectives and communities between some cognitivists and situative/pragmatist-sociohistoricists. In the 1960s and 1970s, experimental paradigms dominated psychology and mathematics education. The cognitivists were the first to emerge from this methodological and theoretical straightjacket, perhaps because information processing psychology and artificial intelligence could make clear claims to being scientific on their own terms. Decades of cognitive research produced significant advances in the understanding of thinking, teaching, and learning. However, the cognitivists emphasis on what goes on inside an individuals head also had its limitations the most obvious being that learning in classrooms is inherently a social process, not especially well suited, it seemed, to analysis by traditional cognitive techniques. Some sociocultural/situative work emphasized those social processes, with a set of observational methods almost complementary to those of the cognitivists. See, for example, the 1997 volume Situated Cognition edited by David Kirshner and James A. Whitson. The reference lists in various chapters have anywhere from a negligible to an almost complete intersection with the references in, the Handbook of Research on Mathematics Teaching and Learning (Grouws, 1992). And, just as a subset of the cognitivists before them had taken pains to declare their independence from narrow experimentalism, some sociocultural researchers declared independence from the cognitivists. It is far from clear that there is an epistemological conflict between the cognitive and situative perspectives. Indeed, the suggestion is made in Greeno, Pearson, & Schoenfeld (1997) that the core difference between the set of points given above for the cognitive and situative perspectives is essentially one of foregrounding and backgrounding: the territory is ultimately the same, and each perspective provides a different entry point to and focus on that territory. In addition, it is important to note that the three main perspectives discussed in these comments the behaviorist/empiricist, cognitive/rationalist and situative/pragmatist-sociohistoric views, like all grand theories, have limited explanatory power in specific circumstances. In engineering, complex design often draws upon multiple theories some global, some local. Airplane design, for example, obviously attends to Newtons laws of motion and of gravitation (grand theories indeed) but it also attends to Bernoullis and Dalemberts principles, and to even more local effects, such as the laws governing the expansion and contraction of metals at different temperatures. Progress will be made more rapidly when theoretical claims are carefully tied to bodies of data, and the set of applicability conditions for the theory are well specified. This is a hallmark of carefully done design experiments: see, e.g., Cobb, Confrey, diSessa, Lehrer, & Schauble, 2003. We now turn to the first category in which there has been major change over the past decade, teacher knowledge. Teacher Knowledge Significant progress has been made over the past decade in understanding mathematics teachers knowledge, how it plays out in practice, and how it can be developed. The field can boast of two major books and two additional programmatic bodies of work, all of which add significantly to our understanding. In brief, the main work described below is as follows. This section begins with a discussion of pedagogical content knowledge. Over the past decade, two major works have emerged that expand the fields conception of the nature and complexity of the knowledge that teachers bring to the classroom. Liping Mas 1999 book Knowing and teaching elementary mathematics demonstrated the unique character of highly accomplished mathematics teachers knowledge a knowledge clearly different from knowledge of the mathematics alone. Magdalene Lamperts 2001 book Teaching Problems and the Problem of Teaching offers a remarkably detailed empirical and theoretical examination of the multiple levels of knowledge, planning, and decision-making entailed in a years teaching. Next, I briefly describe Deborah Ball, Hyman Bass, and their colleagues studies of the mathematical knowledge that supports effective teaching, and the work of Miriam Sherin in describing teachers professional vision. Like the work described before it, this work sheds light on the character of knowledge that enables teachers to interact effectively with students over substantial mathematics. This work is followed by a description of the work by the Teacher Model Group at Berkeley, which has worked to characterize both the nature of teacher knowledge and the ways that it works in practice. Like the work of Ball, Bass, and colleagues, this work characterizes teaching as problem solving. It contributes to the problem solving and teaching literatures by describing, at a theoretical level of mechanism, the kinds of decision-making in which teachers engage as they work to solve the problems of teaching. Pedagogical content knowledge. The study of teacher knowledge was revitalized in the mid-1980s when Lee Shulman (1986, 1987) that introduced the notion of pedagogical content knowledge. Although the term was (as is typical of important new concepts) not clearly defined at the beginning, the very notion of specialized content-related knowledge for teaching caught the fields imagination and opened up significant new arenas for both research and practice. We shall begin by exemplifying the concept and indicating its practical implications, after which we turn to contemporary research. Here is an example familiar to any algebra teacher. Relatively early in the course, one may use the distributive property to show that (a + b)2 = (a + b)(a + b) = a(a + b) + b(a + b) = (a2 + ab) + (ba + b2) = (a2 + ab) + (ab + b2) = a2 + 2ab + b2. Or, one may suggest the truth of the formula with an area model as follows. a + b  a a2 ab + b ba b2 But, one also knows (after having taught the course once) that, later in the course, when students do their homework or one writes the expression (x + y)2 on the blackboard, a significant proportion of the students will complete the expression by writing, incorrectly, (x + y)2 = x2 + y2. The first time this happens, a beginning teacher may be taken aback. But with a little experience, the teacher knows to anticipate this, and to be ready with either examples or explanations. For example, the question Why dont you try your formula with x = 3 and y = 4? can lead the student to see the mistake. It exemplifies yet another valuable strategy (testing formulas with examples if one is unsure), and can set the stage for a more meaningful reprise of the reasons that the formula works the way it does. This kind of knowledge knowing to anticipate specific student understandings and mis-understandings in specific instructional contexts, and having strategies ready to employ when students demonstrate those (mis)understandings, is an example of pedagogical content knowledge (PCK). PCK differs from general pedagogical knowledge, in that it is tied to content. A general suggestion such as generate examples and non-examples of important concepts may seem close, but it hardly arms the teacher with the knowledge for this particular situation (or thousands of others like it). There is a critical aspect of fine-grained domain specificity here: in this situation, this kind of example is likely to prove necessary and useful. PCK also differs from straight content knowledge: one can understand the correct ways to derive the algebraic relationship under discussion without knowing to anticipate student errors. The concept is critically important because it points to a form of knowledge that is now understood to be a central aspect of competent teaching and, one that is at variance with simple notions of teacher training. Some policy-makers and others have a strongly held belief that what is needed for competent teaching in any domain is a combination of subject matter knowledge and either common sense or general pedagogical training. This belief is part of the support structure for a wide range of programs aimed at taking professionals in various mathematical and scientific fields and getting them into the classroom rapidly the expectation being that a bit of pedagogical training (usually aimed at providing classroom control skills) and/or common sense will suffice to prepare those who have solid subject matter backgrounds for the classroom. An understanding of the true bases of pedagogical competency is essential as an antidote to such quick fixes, and as a precondition for bolstering teacher preparation programs in ways that allow them to prepare prospective teachers more adequately. (For more extended discussions of this issue, see National Academy of Education, 2005.) Liping Mas discussion of Profound Understanding of Fundamental Mathematics In simplest terms, Liping Mas 1999 book Knowing and teaching elementary mathematics is a comparison of the knowledge possessed by a relatively small sample of elementary school mathematics teachers in the U.S. and Mainland China. In part, it attempts to resolve an apparent paradox: Chinese mathematics teachers study less formal mathematics and have less formal pedagogical training than their U.S. counterparts (often beginning teaching with a 9th grade degree and two or three years of normal school), but Chinese students outpace U.S. students on international comparisons of mathematical performance. Ma studied 23 above average teachers in the U.S. and 72 teachers from a range of schools in China. Her finding was that the most accomplished teachers in China (approximately 10% of those interviewed) had a form of pedagogical content knowledge she calls profound understanding of fundamental mathematics or PUFM a richly connected web of understandings that gave them a deep understanding of the domain and of ways to help students learn it. Broadly speaking, such knowledge was not present in the U.S. teachers Ma interviewed. In four substantive chapters, Ma studies teachers understandings of: approaches to teaching subtraction with regrouping, student mistakes in multi-digit multiplication, the generation of meaningful contexts and representations to help students understand division by fractions; and explorations of the relationships between perimeters and areas of rectangular figures. Here I shall describe the third of these, division by fractions, and use it as a vehicle for discussing PUFM in general. Ma offered her interviewees the following scenario: People seem to have different approaches to solving problems involving division with fractions. How do you solve a problem like this one?  EMBED Equation.3  Imagine that you are teaching division with fractions. To make this meaningful for kids, something that many teachers try to do is relate mathematics to other things. Sometimes they try to come up with real-world situations or story-problems to show the application of some particular piece of content. What would you say would be a good story or model for  EMBED Equation.3  ? (Ma, 1999, p. 55) Only 9 of the 21 U.S. teachers who worked the problem produced the correct numerical answer to the division problem. This clearly points to a problem with the teachers algorithmic competency. In contrast, all 72 Chinese teachers performed the computation correctly. Some teachers made formal arguments, in effect justifying the algorithm by either explaining why one inverts  EMBED Equation.3  and multiplies by its reciprocal, 2. Some converted to decimals. Of much greater interest, however, are the ways in which teachers offered different story representations for the divisions. In trying to produce stories that could motivate and represent the division, 10 of the U.S. teachers confounded division by  EMBED Equation.3  with division by 2 they discussed two people sharing  EMBED Equation.3  pies, or other objects, equally between them. Six more confounded division by  EMBED Equation.3  with multiplication by  EMBED Equation.3 . Only one of the U.S. teachers generated a story that corresponded correctly to the given division. In contrast, 90% of the Chinese teachers generated appropriate stories for the division. Teachers represented the concept using three different models of division: a measurement model, e.g., how many half-foot lengths are there in something that is 1 and  EMBED Equation.3  feet long?, a partitive model, e.g., If half a length is 1 and  EMBED Equation.3  feet, how long is the whole? products and factors, e.g., If one side of a  EMBED Equation.3  square foot rectangle is  EMBED Equation.3  foot long, how long is the other side? Many of the teachers worked through their stories, giving meaning to the mathematical processes thereby. They demonstrated a wide range of ways to think through, and give meaning to, what it means to divide by one half. Ma proceeds from her empirical description of the Chinese teachers knowledge to a theoretical description. She characterizes their understandings of various mathematical topics (for teaching) as knowledge packages tightly bound collections of information that include the meaning of a given concept and related mathematical concepts, representations of the concept and related mathematical concepts, skills (algorithms) and their conceptual underpinnings; and relationships between all of the above. She argues that a Profound Understanding of Fundamental Mathematics (PUFM) is built up of a well organized collection of such knowledge packages, and she goes on to suggest ways in which teachers develop such understandings. PUFM is fundamentally mathematical the core ideas are about mathematical structure. But it is also fundamentally pedagogical, with an organization aimed at meaning-making and deep understanding. In this sense, the PUFM possessed by an accomplished teacher overlaps with, but is different from, that of an accomplished mathematician. There are likely to be aspects of elementary mathematics such as rational number (fractions) that any mathematician knows, and that a highly accomplished teacher does not know for example, the formal definition of the rational numbers as equivalence classes of ordered pairs of integers. But, there are also aspects of elementary mathematics that teachers with PUFM possess, and professional mathematicians do not. These include having a substantial number of ways of giving meaning to mathematical operations and concepts, and seeing and fostering connections among them. PUFM represents a deeper, more connected understanding of elementary mathematical sense-making than mathematicians are likely to know. It is a different (though related) form of knowledge. Magdalene Lamperts Teaching Problems and the Problem of Teaching In Teaching Problems and the Problem of Teaching, Lampert (2001) takes on the extraordinarily difficult challenge of unraveling the complexities of teaching of portraying the complex knowledge, planning, and decision-making in which she engaged, over the course of a year, as she taught a class in fifth grade mathematics. This book is an eloquent and elegant antidote to simplistic views of the teaching process. Lampert writes: One reason teaching is a complex practice is that many of the problems a teacher must address to get students to learn occur simultaneously, not one after another. Because of this simultaneity, several different problems must be addressed by a single action. And a teachers actions are not taken independently; there are inter-actions with students, individually and as a group. When I am teaching fifth-grade mathematics, for example, I teach a mathematical idea or procedure to a student while also teaching that student to be civil to classmates and to me, to complete the tasks assigned, and to think of herself or himself and everyone else in the class as capable of learning, no matter what their gender, race, or parents income. As I work to get students to learn something like improper fractions, I know I will also need to be teaching them the meaning of division, how division relates to other operations, and the nature of our number system. (Lampert, 2001, p. 2). Lampert views and portrays her teaching through multiple lenses. She begins close up, with a view of a specific lesson on rate. One day her students enter the classroom after recess and find the following problem on the board: Condition: A car is going 55 mph. Make a diagram to show where it will be: after an hour after two hours after half an hour after 15 minutes. Lampert describes individual students in the class, and what they began to do with the problem. She shows the varied representations students made, which provide insights into the students current state of understanding. She then describes her work in orchestrating a communal discussion of the problem, and the representation she used. She then zooms in on one particular interaction, which occurred when a student wrote an answer to part D of the problem on the board that she could not understand. As she often does, she asked the class if others could explain where that answer might have come from. She calls on a student whom she thinks will do so, but that student asks instead if she can explain her own solution. This raises a dilemma for Lampert. Which train of reasoning does she follow? In doing so, (a) whom does she run the risk of enfranchising or disenfranchising, and what implications will this have for the power relationships developing in the classroom? (b) which aspects of the mathematics will be publicly aired, helping other students to connect not only to the correct answer but to think through the various ways of understanding the problem? As she wrestles with this, the first student asks to change what he has written. He does, and the number he places on the board is close to the right answer. Now Lampert faces yet another choice. How can she unpack this students thinking, so the class can see how and why he arrived at it, and orchestrate a classroom conversation that will result in the student and the class figuring out the right answer? How can she do so in a way that teaches meta-lessons about reviewing and verifying ones work, that connects to as many of the students understandings as possible, and that reinforces the classrooms norms of respectful and substantive mathematical interactions? All this and more happens in one segment of one lesson. And, a lesson is a very small part of a year (which, it should be noted, is 10% of a fifth-graders life-to-date, so personal as well as intellectual development is a very big issue!). The art of Lamperts book is that she presents the incidents in enough detail to allow one to experience them, at least vicariously; then she steps back, providing an analytic commentary on what took place. Over the course of the book, Lampert displays and reflects upon multiple aspects of her teaching, at various levels of grain size. In an early chapter, she presents her reflections and notes on how to get the year started. She identifies her major goals. She compiles a list of productive activities. She views the year through a content lens students will need to learn the concept of fraction, long division and multiplication, and more. She considers issues related to learning the practice of mathematics, things like: revision; hypothesizing; giving evidence, explanation; representation. There are issues of physical environment. These are planned in some detail, and then revised in response to ongoing reality who the students are, and how things seem to be working. Here too, Lampert presents a substantial amount of detail. If you want students to learn how to make conjectures public, and then to work through those conjectures respectfully (including challenging others ideas and/or retracting ones own when it turns out not to be right), one must to pick problems that will support rich interactions, and work on establishing the right classroom norms. Some of Lamperts discussions, like that of the automobile rate problem, describe teaching in-the-moment. Some involve planning to establish both mathematical content and classroom culture. Some involve making design choices. Given a particular topic, which examples will be accessible to students, will support rich reasoning, will bring the students to confront the central conceptual issues in the domain? How does one develop appropriate pedagogies for independent work (one goal is to have students develop as independent thinkers), for small group work (one goal is to have students learn to interact well and closely with each other, and profit from those interactions), and whole-class discussions? How can the curriculum be arranged to help students see mathematical connections? How can she simultaneously cover the material mandated by her school district and state curriculum frameworks? These are serious design and implementation issues. As noted above, classroom considerations for a fifth grade teacher go far beyond issues of content. A chapter of Lamperts book is devoted to teaching students to be people who study in school. How does one realize goals such as teaching intellectual courage, intellectual honesty, and wise restraint having students learn to be willing to take considered risks, be ready to change their position with regard to an issue on the basis of new evidence, but weighing evidence carefully before taking or revising a position? How does one define accomplishment, and establish classroom norms consistent with that definition? Here too, Lampert stakes out a particular kind of territory and then explains how she works toward the goals he has defined. In a final theoretical chapter, Lampert presents an elaborated model of teaching practice. There she reframes the problems of teaching multiple students at the same time, and the social complexities of practice; the problems of teaching over time; the complexities of teaching content with a curriculum that is largely problem-based; and the complexities of teaching in an environment where all the actors students as well as the teacher are taken seriously as contributors to a goal-oriented, emergent agenda. This model, and the book, raise far more questions than they resolve. But that is as it should be. Lampert has taken an ill-understood domain and portrayed its complexity. She has done so in a structured and theoretical way, which makes that complexity accessible and identifies key dimensions of teaching performance and goals. Now that the framework exists, further work by others should move toward the elaboration of the model and toward practical research questions of teacher development toward the kinds of competencies described in it. Ball, Bass, and Colleagues Study of Mathematical Knowledge for Teaching. Deborah Ball, Hyman Bass, and colleagues have embarked on a number of projects (e.g., the Study of Instructional Improvement, the Mathematics Teaching and Learning to Teach Project, the Learning Mathematics for Teaching Project, and the Center for Proficiency in Teaching Mathematics) aimed at understanding the mathematical competencies that underlie teaching. Like the work described above, this growing body of work is predicated on the assumption that mathematics teaching is a deeply mathematical act that is built on a base of mathematical understanding and that also calls for different types of knowledge. The groups research agenda, writ large, is to understand the mathematical underpinnings for a broad range of pedagogical undertakings, to understand how the teachers knowledge shapes their classroom practices, and how those practices ultimately affect student learning in mathematics. Papers that describe this agenda and document some progress toward its achievement, include Ball & Bass, 2000, 2003b; Ball & Rowan, 2004; Cohen, Raudenbush, & Ball, 2003; Hill & Ball, 2004; Hill, Schilling, & Ball, 2004; Hill, Rowan, & Ball, in press; the RAND mathematics study panel report, 2002; and the Study of Instructional Improvement, 2002. A central component of this enterprise is the creation of a series of measures that serve to document teacher knowledge and its impact (see http://www.sii.soe.umich.edu/instruments.html, and Study of Instructional Improvement, 2002). As an example, one of the projects released assessment items shows three hypothetical students work on multiplying multi-digit numbers: Student AStudent BStudent C x3 25 5 x3 25 5 x325 5 +1 72 55 +1 77 05 0 12 55 0875875 +1 6000 0875 The item asks teachers to identify which of the students might be using a method that could be used in general. Answering the item correctly involved inferring the procedure used by the student in each case, and judging whether it will always produce a correct answer. This involves substantial mathematical problem solving, and extends far beyond knowing and being able to demonstrate the standard procedure. Other items under development examine key aspects of competency in central areas of the elementary mathematics curriculum. Ball and colleagues are beginning to use such measures to document the impact of professional development interventions in mathematics: see Hill & Ball, 2004. Sherins studies of teachers professional vision. A body of studies that sits squarely at the intersection of teacher knowledge and teacher learning has been conducted for some years by Miriam Sherin (Sherin, 2001, 2002, 2004; Sherin & Han, 2004). A key construct employed by Sherin, reflecting an important part of accomplished teachers knowledge, is an adaptation of Charles Goodwins (1994) notion of professional vision. Imagine that you are standing at the site of an archaeological dig. On your left, you see a large rock with a dent in the middle. Next to it you see a pile of smaller stones. Aside from this, all you see is sand. An archeologist soon appears at the site. What looked like just a rock to you, he recognizes as the base of a column; the small stones, a set of architectural fragments. And where you saw only sand, he begins to visualize the structure that stood here years before. The archaeologist has learned to notice variations in the color, texture, and consistency of sand and to see collections of stones as possible elements of a larger structure. This then is part of the archeologists professional vision. (Sherin, 2001, p. 75.) Sherin argues that teachers, like archeologists and other professionals, develop a particular type of perception to which members of particular professions are attuned. Doctors recognize clusters of symptoms where laypeople may note individual symptoms or none at all. Similarly, mechanics see and hear functions and malfunctions in mechanical devices; architects note structural stability and other characteristics of buildings; and so on. In the case of teaching, Sherin argues that one form of professional vision is a shift from a focus on pedagogy (examining the moves teachers make in particular circumstances) to a perspective that includes a more intense and critical focus on students thinking. Sherin & Han (2004) document the use of video clubs (meetings in which one or more teachers, in collaboration with university researchers, examine videotapes of the participating teachers classrooms) as a powerful form of professional development, which can serve as a catalyst for this kind of change. In these video clubs, initial conversations about stimulus videotapes typically involved teachers commenting on pedagogy and researchers focusing on student thinking. Over time, the balance changed. Toward the end of the yearlong series of conversations, the bulk of teacher-initiated comments focused on student thinking and, teachers comments both explored the meanings of students statements and synthesized student ideas. This feeds into pedagogy, of course but into a diagnostic, student-based pedagogy, which is more typical of accomplished teachers. The Berkeley Teacher Model Groups Modeling of the Teaching Process. The next body of research discussed here lies at the intersection of research on problem solving and on teaching. Although it overlaps substantially with other work described in this section, it also differs substantially in style. Hence some background is necessary to contextualize it. Problem solving research had its origins in laboratory studies. Given the rather limited state of the art, the range of cognitive phenomena that could be modeled or otherwise rigorously characterized in the 1960s and 1970s was quite small. Researchers such as Newell and Simon (1972) brought people into their laboratories to solve problems out loud. They produced transcripts of those sessions and examined them for regularities in productive problem solving behavior, which were then abstracted as problem solving strategies. In the late 1970s and early 1980s, it was pushing the envelope to try to make sense of a twenty-minute videotape of individuals working problems by themselves. Constructs that are now taken for granted, monitoring and self-regulation and belief systems, for example, were first being uncovered. Early problem solving studies represented a first set of steps toward a much broader goal, understanding human cognition in complex social circumstances. The somewhat sterile laboratory conditions in early studies were necessary in order to isolate and understand the cognitive phenomena that are taken for granted today, and to develop the kinds of analytic tools and techniques (e.g., cognitive modeling) that could then be used to analyze more complex and realistic situations. A major goal of the Teacher Model Group at Berkeley has been to move toward the modeling of increasingly complex behavior first problem solving in the laboratory, then in tutoring, and finally in teaching. There are at least two dimensions of complexity here. The first is the complexity of the task. Problem solvers in the laboratory had essentially one goal: solve the given problem. Tutors goals are more complex, as they hope to facilitate learning and must take many other factors related to their students knowledge into account. And, as Lamperts book makes abundantly clear, teachers are working toward many goals at once: among them having students learn the content under discussion, connect it to other content, learn to become good students, learn to interact productively with other, and develop productively as people. The task of teaching is far more multi-dimensional than the task of solving mathematics problems. Second, mathematics problems (at least in the laboratory) are static. In contrast, the problems one encounters while teaching are highly interactive and contingent: new issues arise constantly and must be dealt with. A second major goal has been to address the one major theoretical problem remaining in research on problem solving. As noted above, research through the 1980s produced a framework for the analysis of mathematical problem solving one that included aspects of the knowledge base (knowledge and strategies), of decision-making (including monitoring and self-regulation), and of beliefs (which shape the problem solvers choice of actions). What was lacking was a theory a specification of how all this fit together, and explained how and why individuals made the problem solving choices they did, on a moment-to-moment basis. The Teacher Model Group (TMG) has worked to address these issues by building a theory of teaching that produces analytic models of teachers classroom behavior. These models have the specificity typical of cognitive modeling. They seek to capture how and why, on a moment-by-moment basis, teachers make the decisions they do in the midst of their teaching. The TMG began by studying the tutoring process. Tutoring sessions, like problem-solving sessions, are goal-oriented the goal being to help the student learn some material. They are, however, highly contingent, depending on what the student being tutored does at any given time. The TMG developed an analytic structure (architecture) that was used to model the tutoring behavior of a range of tutors with very different tutoring styles (Arcavi & Schoenfeld, 1992; Schoenfeld, Gamoran, Kessel, Leonard, Orbach, & Arcavi, 1992). This general architecture worked at a level of mechanism, explaining how and why choices are made during tutoring. It also set the stage for modeling the teaching process. In a series of papers, Schoenfeld and the teacher model group (Schoenfeld, 1998a, 1999, 2000, 2002a, 2005; Schoenfeld, Minstrell & van Zee, 2000) used a theory-based approach to model an increasingly complex and widely varying set of teaching episodes. Some of the detail is highly technical two of the papers are approximately 100 pages long so this chapter will provide only a brief overview summary of the relevant ideas. The basic idea is that a teachers decision-making can be represented by a goal-driven architecture, in which ongoing decision-making (problem solving) is a function of that teachers knowledge, goals, and beliefs. The teacher enters the classroom with a particular set of goals in mind, and some plans for achieving them. At any given time, activated goals may include short-term goals (having students learn the particular content intended for this lesson), medium-term goals (creating and maintaining a supportive climate in which students feel that they can take risks and interact in substantial ways over subject matter), and long-term goals (having students come to see the discipline as a form of sense-making; aiding in their intellectual and personal development). Plans are chosen by the teacher on the basis of his or her beliefs and values. That is, if a teacher believes that skills are crucially important, the plan may include a fair amount of drill. If the teacher wants to foster a certain kind of conceptual understanding, then the activities chosen for the class will reflect that. The teacher then sets things in motion and monitors lesson progress. If there are no untoward or unusual events, various goals are satisfied and other goals and activities take their place as planned. If something unusual does take place, then a decision is called for the teacher will decide whether to set a new goal on the basis of what he or she believes is important at the moment. If a new high-priority goal is established, the teacher will search through his or her knowledge base for actions to meet that goal (and perhaps other high priority goals as well). This results in a change of direction, with a new top-level goal. When that goal is satisfied, there may be a return to the previously suspended goal, or a re-prioritization. The analyses of teaching conducted by TMG work at a line-by-line level. Space allows just for one example. In an introductory lesson, Jim Minstrells class has been discussing ways of computing the best number to represent a collection of data. Students have discussed whether outliers should be included in the data set; they have begun to discuss representing the data with a single number by the average, by the mode. At that point a student raises her hand and says This is a little complicated but I mean it might work. If you see that 107 shows up 4 times, you give it a coefficient of 4, and then 107.5 only shows up one time, you give it a coefficient of one, you add all those up and then you divide by the number of coefficients you have. The question: is enough known about Minstrell, in a principled way, to explain what he does (and even to predict what he is likely to do)? Before proceeding, it should be noted that a teacher in this kind of situation has many options. For example, the teacher might plausibly decide to: stick to the lesson plan, and tell the student theyll discuss it after class; defer the discussion until the next day, and come in with a prepared lecture; clear up the issue raised by the student (Thats really interesting. Youve introduced something that looks like what we call the weighted average) put the lesson plan on hold to pursue the issue raised by the student, even if it takes a while. Although these are all possibilities in the abstract, they are not equally likely for Minstrell. TMGs model of Minstrell includes his goals and beliefs, which include having students experience physics as a sense-making activity; creating a classroom climate in which students feel free to (and rewarded for) pursuing content-related ideas in sensible ways; and having students learn to sort such things out. Minstrell also believes in minimizing teacher telling, and has developed a technique he calls reflective tosses in which he often answers questions with questions, clarifying things but leaving responsibility for generating (at least partial) answers to them with the students. Thus, confronted with the question from the student, the model acts as follows. The question is germane and substantive. It reflects serious engagement on the part of the student, and its clarification will be a clear act of sense-making. Addressing it will provide an opportunity to live the sense-making values he espouses in the classroom. So he will address it, now and in full. How? Via reflective tosses. He will ask the student to clarify what she means, and ask her and the class how her proposed formula relates to the simple version of average (add up all the numbers and divide by the number of numbers you have) that the class had already discussed. The model of teaching developed by TMG has been used to characterize the teaching of one beginning teacher teaching traditional content, one experienced high school teacher and one experienced college teacher teaching lessons of their own design; and one experienced third-grade teacher teaching a lesson in which the days lesson goes off in directions completely unplanned by the teacher. It thus serves to cover a fair part of the teaching space. The fact that such a diverse collection of teachers has been successfully modeled suggests that the underlying architecture of the model, and the theory it instantiates that teachers decision-making and problem-solving are a function of the teachers knowledge, goals, and beliefs is robust. This in turn suggests a series of practical applications. First, the better one understands how something is done, the better one can diagnose it and assist others in their professional growth. Second, it may be possible to delineate typical developmental trajectories of teaching skill, aiding in professional development. Third, close analysis has revealed some surprising similarities and common teaching routines in what, on the surface, seem to be the very different classroom action by teachers such as Deborah Ball, Jim Minstrell, and myself. These routines may be things that novice teachers can learn. (See, e.g., Schoenfeld, 2002a). Teacher Learning Issues of Professional Development The content of the preceding section on teacher knowledge leads naturally to the issue of the growth and change of teacher knowledge and hence to issues of teacher learning and professional development. In this regard, it is important to recall injunction found in How People Learn (National Research Council, 2002a, expanded edition) that learning is learning, whether the learner is child or adult (or, specifically, a teacher). That is, the mechanisms by which adults and children learn are the same as are issues of identity, engagement, conceptual understanding, and the development of productive practices. Some of the most interesting approaches to professional development are those that take the notion of teacher learning seriously. In various ways, a focus on student thinking is a hallmark of the most noted approaches to professional development. Here we briefly discuss three such approaches. The discussions of the professional development workshops are largely pragmatic, but the efforts are grounded in research (for example, CGI was developed to capitalize on a large body of research about student understanding) and the examinations of the impact of the professional development contribute to our understanding of teacher learning. In what follows we briefly describe the Developing Mathematical Ideas (DMI) program, Cognitively Guided Instruction (CGI), and lesson study. Developing Mathematical Ideas (DMI). The DMI program (Cohen, 2004; Schifter, 1993, 1998; Schifter, Bastable, & Russell, 1999; Schifter & Fosnot, 1993; Schifter, Russell, & Bastable, 1990) is a professional development seminar for elementary school teachers of mathematics. In a section of Schifter (2001) entitled What mathematical skills do teachers need? Schifter identifies and exemplifies four critical skills that, she says, are often absent: Skill 1: Attending to the mathematics in what ones students are saying and doing. This may sound obvious, but, as Sherins work indicates, focusing on student thinking is actually a learned skill and not necessarily one that teachers have when they emerge from their teacher preparation programs. Skill 2: Assessing the mathematical validity of students ideas. Recall the example from the Study of Instructional Improvement (2002), given above, which showed three different ways that students might find the product (35 ( 25) The issue is: even if the work looks non-standard, is the mathematics correct? Skill 3: Listening for the sense in students mathematical thinking even when something is amiss. Once one is alert to the mathematical possibilities in student thinking, one can often find the core of a correct mathematical approach in something that produces an incorrect answer. This gives something to build on. Skill 4: Identifying the conceptual issues the students are working on. Schifter provides an example of a student responding to a problem with a strange combination of arithmetic operations. Upon closer examination, the students work is seen to represent an incorrect generalization of a strategy that was useful in a different context. This provided the basis for an interesting mathematical conversation with the student. The DMI program attempts to provide a series of experiences that help teachers develop these skills. Cohen (2004) provides a detailed description of one of the DMI seminars and its impact on the participants. . There is much to learn from the close and sympathetic examination of adult learners Cognitively Guided Instruction. Focusing on student thinking lies at the core of one of the most widely known programs of professional development, Cognitively Guided Instruction, or CGI (Carpenter, Fennema, and Franke, 1996.). Carpenter, Fennema, and Franke (1996) describe their approach as follows: We propose that an understanding of students thinking can provide coherence to teachers pedagogical content knowledge and their knowledge of subject matter, curriculum, and pedagogy Our major thesis is that children enter school with a great deal of informal or intuitive knowledge of mathematics that can serve as the basis for developing much of the formal mathematics of the primary school curriculum. The development of abstract symbolic procedures is characterized as progressive abstractions of students attempts to model action and relations depicted in problems. (Carpenter, Fennema, and Franke, 1996, p. 3.) CGI is based on an extensive body of developmental research on students understanding of elementary mathematical situations for example, the mathematically isomorphic change situation in join form: Connie had 5 marbles. Jim gave her 8 more marbles. How many marbles does Connie have altogether? and in separate form: Connie had 13 marbles. She gave 5 marbles to Jim. How many marbles does she have left? Research summarized in Carpenter (1985) documented the kinds of models children constructed to represent such situations and a developmental trajectory of the growth in the childrens models and their linkages to arithmetic operations. This knowledge base provides a solid grounding with which teachers can interact with students. When a student faces a particular situation, the teacher (guided by a knowledge of developmental trajectories in general, and possessing a repertoire of situation models and ways to formalize them) can determine which understanding the student has, and help the student (a) solve problems based on those understandings, and (b) conceptualize and formalize what he or she knows, thus expanding the students knowledge base. CGI does not offer a prescriptive pedagogy; rather, it provides the knowledge by which teachers can respond flexibly to and build on their students current understandings. A large body of research (see, e.g., Carpenter, Fennema, & Franke, 1996; Carpenter, Fennema, Franke, Empson, & Levi, 1999; Carpenter, Franke, Jacobs, & Fennema, 1998; Carpenter & Lehrer, 1999; Franke, Levi, Carpenter, & Fennema, 2001) indicates that as teachers become more familiar with student understanding, they become more flexible in their teaching and that the effects of the professional development support generative growth in teachers understanding over time (Franke, Levi, Carpenter, & Fennema, 2001). A difference between CGI and DMI identified by Carpenter, Fennema and Franke (1996) is that CGI explicitly uses an understanding of student work to help teachers develop deeper understandings of the mathematics itself, while DMI uses the study of mathematics to sensitize teachers to a wide range of students mathematical thought processes. It would seem that these two emphases are part of a productive dialectic in teachers professional growth. Awareness of student cognition provides an opportunity to think more deeply about mathematics and student conceptions of mathematics. These, in turn, can shape instructional practices, and reflection on those can provide deeper awareness of student cognition. Lesson study. Lesson study, a form of on-the-job professional development (or better, an aspect of teacher professionalism) in Japan, has the potential to either become the next large-scale educational fad in the U.S. or a powerful form of professional development. The practice has received widespread attention in the West largely as a result of a book entitled The teaching gap (Stigler & Hiebert, 1999). Stigler & Hiebert explored possible explanations mathematics performance data revealed by the Third International Mathematics and Science Study, or TIMSS. A wide range of performance reports (see, e.g., Beaton, Mullis, Martin, Gonzalez, Kelly, & Smith, 1997, Kelley, Mullis, & Martin, 2000; Mullis, Martin, Beaton, Gonzalez, Kelly, and Smith, 1998; Mullis, Martin, Gonzalez, Gregory, Garden, OConnor, Chrostowski, & Smith, 2000) indicated that the mathematics performance of U.S. students was roughly at the median internationally (and toward the bottom of scores for highly industrialized nations), while Singapore, Korea, and Japan scored consistently at the top. TIMSS video studies (see, e.g., Hiebert, Gallimore, Garnier, Givvin, Hollingsworth, Jacobs, Chui, Wearne, Smith, Kersting, Manaster, Tseng, Etterbeek, Manaster, Gonzales, & Stigler, 2003; Stigler, Gonzales, Kawanaka, Knoll, & Serrano, 1999) provided compelling evidence that Japanese mathematics lessons were far more coherent than parallel mathematics lessons in the Unites States. Stigler and Hiebert (1999) argue that teaching is a cultural activity that there is relatively little within-country variation in teaching practices compared to between-country variation. That is, the teaching styles in the U.S. and in Japan are relatively consistent, and different. So are forms of professional development. A key component of instructional improvement is lesson study the design, implementation, testing, and improvement, by teachers, of research lessons. The most detailed examination to date of the principles and practices of lesson study can be found in Fernandez & Yoshida (2004). Fernandez and Yoshida provide extensive detail regarding the ways in which a collective of Japanese schoolteachers select a topic of curricular importance, identify the focus of the intended research lesson or lessons, and begin to design the lesson(s). The level of specificity in these deliberations is extraordinary. A typical lesson plan in the U.S. consists of the description of a sequence of intended teacher actions. In contrast, lesson plans developed as part of for lesson study include descriptions of: the sequence of intended learning activities; the ways in which students are expected to react to each of these activities; a planned teacher response of each of the likely student reactions; and intellectual foci for the evaluation of the progress of the lesson. Extensively detailed lesson plans are developed and refined by a teacher planning group over a sequence of meetings, as a truly collaborative effort. A group member then volunteers to teach the research lesson, for the collective. The lesson is not seen as the individual teachers property. Instead, the teacher is seen as the means of implementation of the groups design. The other teachers observe the trial lesson closely, looking to see what seems to be effective and what is not. The collective then debriefs in an elaborate process that leads to the refinement and re-teaching of the lesson by someone else. Ultimately, the tangible product is a shared lesson that is extremely well designed and documented, so that all the participants (and others) can use it. A somewhat intangible but equally important product is the professional growth of those who contribute to the design process. The sequence of lesson design activities consists of thinking hard about the desired content and learning outcomes; about activities intended to promote those outcomes; about student thinking (including anticipating student reactions to activities, and what those reactions mean in terms of student understanding); and about principled revisions to the materials on the basis of careful assessments of student learning. Beginning teachers undertake these activities in the company of more experienced and accomplished colleagues, so there is a natural apprenticeship into the community of skilled practitioners. There is significant potential for appropriate adaptations of aspects of lesson study to powerful mechanisms for professional development in school systems outside of Japan. At the same time, there is significant potential for the practices of lesson study to be trivialized in ways that render the process superficial and of little or no value. As summarized briefly above, a major component of lesson study involves focusing on student understanding, and then evaluating the pedagogy on the basis of the impact of the designed activities. The lessons design practices described by Yoshida and Fernandez (2004) take place at a very fine level of detail, much more fine-grained than those typically conceptualized by American teachers. As Sherin (2001, 2002) and others have shown, focusing on student work does not necessarily come naturally; one has to learn how to do it. In this authors experience, and that of others who have observed attempts to implement lesson study in the U.S., teachers need to learn how to judge lesson effectiveness. Teachers first judgments about lesson effectiveness are often global and not grounded in data. One hears statements like the timing felt pretty good or they were engaged most of the time much more frequently than one hears commentary on the actual content of what students said and did. The question, then, is whether teachers will be provided the support structures (including time, and perhaps external resources until teachers have developed the relevant skills and understandings) that will enable them to bootstrap the skills needed to implement lesson study effectively. Absent such support, the prognosis is not good. Curriculum development, implementation, controversy, and assessment The 1990s were (in the U.S. and in places around the globe that are influenced by U.S. curricula) the time of the greatest curricular change and controversy since the new math of the 1960s. As noted above, research over the latter part of the 20th century produced new understandings about the nature of mathematical thinking and learning ideas that would result in the reconsideration of the foci and contents of mathematics curricula. New goals for curricula were codified in the National Council of Teachers of Mathematics 1989 Curriculum and evaluation standards for school mathematics. Concurrently, perceptions of national economic crises provided an impetus for the revision of mathematics curricula. With a significant infusion of funding from the National Science Foundation, a number of standards-based curricula were developed. Many of these curricula, produced in the 1990s, differed substantially in look, feel, and classroom implementation from traditional curricula. Many turned out to be controversial so much so that the term math wars was coined to describe the public controversies that followed. Resolving such controversies depends, or course, on the evidence available. This raises issues of assessment: what should be assessed regarding mathematical thinking and learning, and how does one assess such things? What should be examined when one examines the impact of various curricula? How does one examine curricular impact in rigorous and informative ways? Those are the issues explored in this section. Context By the mid-1980s, scholars in mathematics education had reconceived the epistemological foundations of mathematics learning. Broadly speaking, the view of mathematics learning as the acquisition of knowledge had been superseded by the perspective that being competent at mathematics meant understanding and being able to use mathematical concepts and procedures and that in addition, strategic competence, metacognitive ability (including monitoring and self-regulation), and productive beliefs and affect (or disposition) were important aspects of mathematical competence. The second origin is sociopolitical. Earlier in this chapter I noted the existence of periodic crises in American mathematics education, usually stimulated by economic or military threats to the nations well-being. Thus, for example, the military provided its recruits basic mathematical training during World War II because of perceived inadequacies in the curriculum. Major curricular efforts in mathematics and the sciences were undertaken in response to the Soviet Unions 1957 launch of the satellite Sputnik. A Nation at Risk and the economic crises to which it was responding over the 1970s and 1980s were to serve as catalysts for another round of curricular change. However, for the reasons explained below, it was not possible, at first, for the federal government to sponsor the change effort. In response to the launch of Sputnik in 1957, and to provide intellectual armament for the cold war, the U. S. had mobilized mathematicians and scientists in the service of producing new curricula. Much of the funding for the new curricula came from the National Science Foundation. Curricula produced during the post-Sputnik years included BSCS (Biological Sciences Curriculum Study), Chem Study, (Physical Science Study Committee (PSSC) Physics, and SMSG (School Mathematics Study Group, one of the new curricula known collectively as the New Math). Some of these curricula led long and happy lives; some, particularly the mathematics curricula, were controversial. But one, Man: A Course of Study, (MACOS) caused great difficulties at the National Science Foundation. MACOS was a hands on elementary school science and social science curriculum. It was well received at first, and the curriculum was distributed widely. Then things changed, largely because MACOS claimed that the theory of evolution was well documented. A minister in Florida who was offended by MACOS claimed that it advocated sex education, evolution, a hippie-yippee philosophy, pornography, gun control, and Communism. He broadcast a series of highly critical radio programs, which catalyzed further attacks on the curriculum, culminating in a full scale Congressional debate of MACOS in both houses in 1975. The events surrounding MACOS have been described as the worst political crisis in NSF history (see Lappan, 1997). Simply put, the idea of supporting curriculum development was a post-MACOS impossibility at NSF. NSF officials had been told by powerful members of congress that further attempts to support curriculum development (which, from that particular congressional perspective, would be imposing a de facto national curriculum in a nation that prizes states rights) would result in dire consequences for the Foundation. A Nation at Risk was thus published at an unusual time politically. There was a mandate for change, but no federal mechanism to support it. The National Council of Teachers of Mathematics (NCTM), a professional organization of mathematics teachers, stepped into the breach. Using its own money, NCTM produced the Curriculum and Evaluation Standards (subsequently known as the Standards). A writing team of about two dozen authors worked over two summers to produce the document, which was published in 1989. The Standards were a philosophical as well as a curricular document. The goal of the writers was to create a coherent vision of what it means to be mathematically literate in a rapidly changing world, and to create a set of standards to guide the revision of the school mathematics curriculum. (p. 1). The authors defined standard as follows: Standard. A standard is a statement that can be used to judge the quality of a mathematics curriculum or methods of evaluation. Thus, standards are statements about what is valued. (p. 2) That is, the Standards were intended to be a statement of what matters in mathematics instruction or testing. They were not intended to be a blueprint for curriculum development. Philosophically, they focused on new goals for students and society: New social goals for education include (1) mathematically literate workers, (2) lifelong learning, (3) opportunity for all, and (4) an informed electorate. (p. 3) The Standards were oriented toward five general goals for all students: (1) that they learn to value mathematics, (2) that they become confident in their ability to do mathematics, (3) that they become mathematical problem solvers, (4) that they learn to communicate mathematically, and (5) that they learn to reason mathematically. (p. 5) Here I shall focus on the curricular descriptions found in the Standards the first three sections, which discuss curricular desiderata in kindergarten through grade 4, grades 5-8, and grades 9-12 respectively. A fourth section, which discussed standards for student and program evaluation, has had much less influence and will not be discussed here. Each of the three grade band sections contained 13 or 14 Standards. For the first time in curricular history, a major curriculum document gave as much attention to the process aspects of mathematical performance as it did to the mathematical content to be covered in the curriculum. At each of the grade bands, the first four standards were the same: Mathematics as Problem Solving Mathematics as Communication Mathematics as Reasoning Mathematical Connections The remaining standards described content but again, in a very broad way, covering four or five grades at a time. As a result, there was no single model curriculum that fit or met the Standards; one could imagine a wide range of very different curricula that had the same content and process emphases, and that achieved the same broad goals. (Indeed, Michael Apple (1992) called the Standards a slogan system precisely because of their lack of specificity and the fact that people could read so many different things into them.) The existence of the Standards altered the political landscape. NCTM leaders worked very hard to get the document taken seriously it was distributed free to all NCTM members, made the focus of NCTM conferences, and used as a rallying point by those interested in reforming mathematics instruction. They succeeded beyond their wildest expectations. And, the very character of the document opened up a new set of opportunities for the National Science Foundation. In 1989 no commercial publisher would undertake the creation and production of standards-based mathematics curricula, because doing so was too risky in financial terms. Mathematics curricula were typically sold in K-8 series, which were produced by large writing teams. This was done in something like production-line fashion, to meet the textbook adoption deadlines of major states such as California, Texas, and New York. In order not to lose huge chunks of the market, publishers made sure their books met the adoption criteria of those three states. Publishers claimed the cost of developing and marketing a K-8 series was on the order of $25 million far too much to risk on an untried product. The national context in 1989 looked like this. There was a need for an upgrading of mathematics curricula. The NCTM Standards offered a set of criteria by which a new curriculum could be judged, but they did not specify the way the curriculum should be constructed. Commercial publishers would not make the investment. The non-prescriptive character of the Standards provided an opportunity for NSF to support curriculum development. The Standards did not say what a curriculum should look like. Various curricula could have different pedagogies, different emphases, and different ordering of topics, and still meet the desiderata. Hence NSF could issue a request for proposals to create curricula that met the Standards. In supporting the development of multiple curricula intended to meet the Standards, NSF could address pressing national needs while avoiding the imposition of a de facto national curriculum. The nations school districts would have choice. NSF began issuing requests for proposals (RFPs) for Standards-based curricula in the early 1990s. A list of NSF-supported curriculum projects that can be found at . The Foundation provided support for the development and implementations of standards-based curricula in a variety of ways. For example, NSF sponsored a series of annual Gateway conferences from 1992 through 1998 at which curriculum developers came together to discuss issues of common concern. Table 1 (Senk & Thompson, P. 14.) lists projects that participated in one or more of those annual conferences. ____________________________________________________________ Table 1 Instructional Materials Development Projects Participating in the Gateways Conferences Elementary School Teaching Integrated Math and Science University of Chicago School Mathematics Project Elementary Component Investigations in Number, Data, and Space Cooperative Mathematics Project Middle School Connected Mathematics Project Mathematics in Context Six Through Eight Mathematics (STEM) Middle Grade Mathematics Through Applications Project Seeing and Thinking Mathematically High School Core-Plus mathematics Project Interactive Mathematics Program Mathematics Connections Systemic Initiative for Montana Mathematics & Science, Integrated Math Project (SIMMS IM) Applications/Reform in Secondary Education (ARISE) Connected Geometry Grades 7-12 University of Chicago School Mathematics Project Secondary Component ____________________________________________________________ Later NSF established four national centers devoted to the support of standards-based curricula: the K-12 mathematics curriculum center, whose web site is , an elementary grades curriculum center at , a middle grades center at , and a high school center at . In parallel, the National Council of Teacher of Mathematics, which had catalyzed the national standards movement with the publication of the 1989 Standards, worked steadily to maintain support for standards-based instruction. NCTMs annual meetings focused on Standards-related activities, and NCTM produced a number of publications aimed at helping teachers to implement Standards-based instruction in their classrooms. When the previous version of this Handbook was published in 1996, there was scant evidence either positive or negative regarding the effectiveness of the new curricula. This stands to reason. The NSF curriculum RFPs were first issued in 1991, so in 1996 the various curriculum projects were just completing their first (alpha) round of development. Indeed, it was not until the turn of the 21st century that cohorts of students had worked through the full beta versions of many of these curricula. The current situation with regard to data evaluating curricular effectiveness is not much better. The current state will be discussed below. First, however, it is important to discuss the largest social confrontation over mathematics curricula since the controversies over the new math. Math Wars While the math wars in the U.S. (and now in parts of the world as far distant as Israel) are in one sense outside the realm of educational psychology (though not social psychology!) and research in mathematics education, they are a critically important phenomenon that needs to be discussed. Researchers need to understand the contexts within which their work is done. For a detailed history of the math wars in California (where they began), see Rosen (2000); see also Jackson (1997a, b) and Schoenfeld (2004). The 1985 California Mathematics Framework was considered a mathematically solid and progressive document. State Superintendent of Education Bill Honig supported educational reform, and the California Mathematics Council (the state affiliate of NCTM) actively supported Standards-based practices after the Standards were published. The 1992 California Mathematics Framework represented a next step in the change agenda. Publishers created texts in line with their view of Standards- and Frameworks-based mathematics. In 1994 the California State Board of Education approved instructional materials consistent with the Mathematics Framework. The Framework, like the Standards, was a vision statement regarding the desired substance and character of instruction rather than a blueprint for them. Such documents allow curriculum designers to create innovative materials that go far beyond the imagination of the authors of the Standards and Framework. But, there was a downside to opening the door to such creativity. Rosen (2000, p. 61) notes that the new textbooks were radically different from the traditional texts orderly, sequential presentation of formulas and pages of practice problems familiar to parents. New texts featured colorful illustrations, assignments with lively, fun names and sidebars discussing topics from the environment to Yoruba mathematics (prompting critics to dub new programs with names such as Rainforest Algebra and MTV Math). Sometimes frenetic in appearance, sometimes different in content, many of the new texts could be easily caricatured. Once the rhetorical battles heated up, they were. In addition, many reformers and reform curricula called for new teaching practices, urging for less dependence on teacher exposition and whole-class recitations, and increased dependence on small group work. Maintaining a focus on substantial mathematics while also fostering communication and collaboration in group work is quite difficult. Teachers who had themselves been taught in traditional ways were now being asked to teach in new ways. Many were not up to the task (see, e.g., Ferrini-Mundy & Schram, 1997.) These new materials and practices raised concerns among some parents, some of whom viewed them as a repetition of the mistakes of the new math. Parent groups organized, established websites hostile to reform, and created a very effective anti-reform movement. Local oppositional movements soon coalesced into a state-wide (and then nation-wide) movement, supported by prominent conservatives such as California Governor Pete Wilson. The state legislature held highly contentious public hearings on the Frameworks in 1995 and 1996. Conservatives prevailed. A new mathematics Frameworks writing team was convened ahead of schedule. The State legislature enacted AB 170, which, according to the official legislative summary, requires the State Board of Education to ensure that the basic instructional materials it adopts for reading and mathematics in grades 1 to 8, inclusive, are based on the fundamental skills required by these subjects, including, but not limited to, systematic, explicit phonics, spelling, and basic computational skills. (See http://www.cde.ca.gov/board/readingfirst/exhibit-i.pdf. For a discussion of the reading wars, see Pearson, 2004.) The next major skirmish took place over the California Mathematics Standards. In line with traditional California practice, a draft was developed by a committee and submitted to the State Board of Education. The orientation of the draft, which had been put together over a year and a half and had undergone a substantial amount of public review, was generally consistent with that of the NCTM Standards. The State Board summarily rejected the draft. Over a period of just a few weeks, it rewrote much of the elementary grades section itself. The Board commissioned mathematics faculty from Stanford (who had negligible experience with K-12 classrooms or curricula) to rewrite the standards for the secondary grades. These acts elicited protests from highly visible scholars such as Hyman Bass, research mathematician and Director of the National Research Councils Mathematical Sciences Education Board, and William Schmidt, who had conducted curriculum content analyses for the Third International Mathematics and Science Study. The Board ignored the protests. How one views these events depends on ones perspective. Here is how anti-reform activist David Klein described them: Question: What would happen if California adopted the best, grade-by-grade mathematics achievement standards in the nation for its public schools? Answer: The education establishment would do everything in its power to make them disappear. In December 1997, the State Board of Education surprised the world by not accepting extremely bad, fuzzy math standards written by one of its advisory committees, the Academic Standards Commission. Instead, in a few short weeks and with the help of four Stanford University math professors, the state board developed and adopted a set of world-class mathematics standards of unprecedented quality for California's public schools. Kleins rhetoric suggests the level of vitriol spewed in the math wars. San Francisco Chronicle columnist Debra Saunders titled one of her periodic anti-reform columns New-New Math: Boot Licking 101 (March 13, 1995) and Maureen DiMarco, California State Secretary of Child Development and Education, referred to the new curricula as fuzzy crap. Acrimony reached the point where U. S. Secretary of Education Richard Riley felt compelled in January 1998 to address the annual Joint Mathematics Meetings, urging civility and respectful exchange in battles over mathematics curricula (Riley, 1998). His words went unheeded, and Riley soon found himself immersed in the math wars: anti-reform forces orchestrated the signature-gathering for an open letter to Riley, published in major newspapers nationwide, protesting the U. S. Department of Educations listing of exemplary and promising instructional programs in mathematics education. In California, those who had power exercised it without restraint. For example, members of the States Curriculum Framework and Criteria Committee were barred from introducing research into the record or into the groups deliberations. Interested readers should see Becker & Jacob (2000), Jacob (1999, 2001), and Jacob & Akers, (2003) for details. The point here is that when educational/psychological issues enter the political arena, scholarly discourse and well-grounded research findings are often marginalized. The research community needs to think about how to deal responsibly with such issues. Our research does little good if it can be ignored for purposes of political expediency. Let me now turn back to research issues and the question of evidence. Just what evidence was there, at the time of the math wars, of the efficacy of traditional or reform curricula? What evidence is there now? Evidence, then and now: Issues of assessment Simply put, the math wars were fought in an informational vacuum. As noted above, the rough chronology is as follows. A few standards-based instructional programs were under development when NSF issued its curricular RFPs in the 1991. Preliminary development of most of the NSF-supported curricula took four or five years, and refinements (to the beta level took another few years. It was not until the late 1990s that full cohorts of students had worked their way through any of the new curricula. Perhaps surprisingly, there are even fewer detailed evaluations of traditional curricula than of the more recent standards-based curricula. The traditional curriculum has existed for many years in various forms over the years, mainstream textbook series came to resemble each other closely in content coverage. However, until recently specifically, until the passage of the No Child Left Behind legislation (see http://www.ed.gov/offices/OESE/esea/) textbook publishers had little or no incentive to gather data regarding student performance. Textbook marketing depends on focus groups (what do the consumers want?) and testimonial in advertising rather than on data. This stands in sharp contrast to the marketing of consumer items such a cellular phones, washing machines and cars, where marketing depends of necessity on focus groups, testimonials, and data. If one wants to buy a new car or washing machine, there are specialist magazines (e.g., Car and Driver or Motor Trend) and general consumer magazines (e.g., Consumer Reports) that evaluate the features of various models on their own or in comparison with others. If a product has a specific design flaw, a bad performance record, or some other problem, that problem will be made public and will need to be addressed. In contrast, until recently, there was no mechanism for curricular performance evaluations in education. Since such assessments are costly, there was no reason for publishers to undertake them. Second and equally important, there is the question of just what a test covers. The standardized tests available until recently, including NAEP, were designed under the standard psychometric assumptions of trait and/or behaviorist psychology (see Glaser & Linn, 1997; Greeno, Pearson, & Schoenfeld, 1997). They focused largely on content mastery. In contrast, the more fine-grained analyses of proficiency developed over the past decade or so (for example the New Standards and Balanced Assessment tests) tend to be aligned with the content and process delineations found in NCTMs (2000) Principles and Standards for School Mathematics: Content: Number and operations Algebra Geometry Measurement Data analysis and probability Process: Problem solving Reasoning and proof Making connections Oral and written communication Uses of mathematical representation Let us consider a topic such as understanding fractions as an example. A traditional assessment would look for students ability to perform standard algorithms, for example Task 1. Find (1/2)(3/5) + (1/2)(1/5). More contemporary assessments might seek to understand students abilities to work with different representations of fractions, for example: Task 2. Write a fraction for the shaded part of the region below  or Task 3. Write a fraction for point A.  Each of Tasks 2 and 3 calls for understanding a particular representation of fractions. Many students will respond 1/4 to Task 2, neglecting the criterion that the four ostensible fourths of the figure must all have equal area. Similarly, many students will respond 2/6 to Task 3. Interestingly, students may answer correctly to one of those two tasks and not the other. Responding correctly depends on some familiarity with the representation. Different tasks may probe for conceptual understanding: Task 4. Explain what happens to the value of a fraction when its denominator is doubled. Or, they may call for a combination of representational use and problem solving. Consider the following problem, for example. Task 5. Write a fraction for the shaded part of the region below.  There are various ways to solve this problem, but here is one: Each of the boxes is 1/5 of the whole region. The diagonal line on the left-hand side of the figure divides the first three boxes in half, so the shaded area on the left is (1/2)(3/5) = (3/10) of the region; the shaded area on the right is (1/2)(1/5) = (1/10) of the region; so the area of the two shaded regions combined is (3/10) + (1/10) = (4/10) = 2/5 of the region. Note that this solution calls for problem solving in making use of a non-standard representation, seeing the rectangle formed by the first three boxes, knowing that the diagonal divides a rectangle in half, obtaining the areas of each of the shaded regions, and performing the numerical computations given above. It stands to reason that many students who could obtain the correct answer to task 1 would fail to obtain the correct answer to task 5 which includes the computation in Task 1 as a sub-problem. These few examples are just the tip of the proverbial iceberg. The point is that what one assesses matters. A student who does well on a test comprised of items like task 1 might do poorly on a test that included tasks 2 through 5; hence a test comprised of such items might yield a false positive for the student, indicating more competency than was actually there. Or, consider two curricula, with Curriculum A focusing on procedural skills and Curriculum B giving attention to skills, conceptual understanding, and problem solving. If a test comprised of items like tasks 1 through 5 was used to assess learning outcomes, curriculum B would most likely outperform curriculum A. But if a test using only items like Task 1 was used, it is possible that both groups would perform comparably an assessment false negative, because the test did not capture a range of understandings possessed by students of curriculum B. This example is not hypothetical. Ridgway, Crust, Burkhardt, Wilcox, Fisher and Foster (2000) compared students performance at grades 3, 5, and 7 on a standardized high-stakes, skills-oriented test (the California STAR test, primarily the SAT-9 examination) with their performance on a much broader standards-based test (the Balanced Assessment tests produced by the Mathematics Assessment Resource Service, or MARS.). For purposes of simplicity, scores reported here are collapsed into two simple categories. A student is reported as being either proficient or not proficient as indicated by his or her scores on each of the examinations. The data are given below. Grade 3 (N=6136): SAT-9Not ProficientProficientMARS Not Proficient27%21%Proficient6%46% Grade 5 (N=5247): SAT-9Not ProficientProficientMARS Not Proficient28%18%Proficient5%49% Grade 7 (N=5037): SAT-9Not ProficientProficientMARS Not Proficient32%28%Proficient2%38% These data suggest that some 22% of the students examined were false positives according to the SAT-9. With this as context, I examine data that provide comparative evaluations of standards-based and more traditional curricula. I first describe the general knowledge base, then findings from the What Works Clearinghouse. As noted above, there exist sparse data regarding the effectiveness of the newer curricula, and even less evidence regarding traditional curricula. This is partly a matter of timing, partly a matter of incentives. Because the first cohorts of students emerged from standards-based curricula just about the turn of the 21st century, there has not been time for extensive studies of those curricula. Most of the newer curricula have been examined, however as proposed alternatives to the status quo, they had to prove themselves. In contrast, the mainstream texts, which dominated the marketplace, had little incentive to prove themselves until the passage of the No Child Left Behind act, known as NCLB. (See for the U. S. Department of Educations web site devoted to NCLB.) The accountability procedures specified in NCLB mandate the gathering of testing data, though they do not specify the content of the tests. Hence the issues discussed above remain central. The most complete record of evaluations of standards-based curricula to date can be found in Senk & Thompson (2003). Senk and Thompson requested assessment information from all of the curriculum developers in the Gateways conferences. At the elementary level, the creators of Math Trailblazers (The Teaching Integrated Math and Science Project), Everyday Mathematics (the University of Chicago School Mathematics Project), Investigations in number, data, and space (TERC), and Number Power: A Cooperative Approach to Mathematics and Social Development (The Cooperative Mathematics Project) contributed chapters to the Senk and Thompson volume. After reviewing the four chapters presenting the elementary curriculum evaluations, Putnam (2003) summarized the results as follows: [These four curricula] all focus in various ways on helping students develop conceptually powerful and useful knowledge of mathematics while avoiding the learning of computational procedures as rote symbolic manipulations. The first striking thing to note about [them] is the overall similarity in their findings. Students in these new curricula generally perform as well as other students on traditional measures of mathematical achievement, including computational skill, and generally do better on formal and informal assessments of conceptual understanding and ability to use mathematics to solve problems. These chapters demonstrate that reform-based mathematics curricula can work. (Putnam, 2003, p. 161). Putnam goes on to note common assumptions underlying the four programs: that there should be a focus on important mathematics, that instruction should build on students current understanding, that learning should be grounded in settings that are meaningful to students, that curricula should build on students informal knowledge and help them formalize what they learn; and that the curricula call for teachers guiding students through learning experiences to achieve curricular goals. He also notes the difficulties of using widely available standardized measures: A disadvantage in using standardized measures is that they often do not shed much light on the more complex mathematical understanding, reasoning, and problem solving emphasized in the new curricula. This is the curricular false negative problem mentioned above. Putnam observes that the authors of the curricula used a range of measures to get at competencies not revealed by standardized measures, including evaluator-developed measures, with their concomitant strengths and weaknesses. (Putnam, 2003, p. 166). The story was much the same at the middle school level, where Senk and Thompson present evaluations of the Connected Mathematics curriculum, Mathematics in Context, and Middle Grades MATH Thematics: The STEM Project. Chappelle (2003) notes similarities and differences across the curricula. Like the elementary curricula, these middle school curricula are grounded in NCTMs 1989 Standards; they too focus on meaningful and engaging problem-based mathematics. There are differences in emphases and style, but the similarities in character and outcomes outweigh the differences. Chappell summarizes the results as follows: Collectively, the evaluation results provide converging evidence that Standards-based curricula may positively affect middle-school students mathematical achievement, both in conceptual and procedural understanding. They reveal that the curricula can indeed push students beyond the basics to more in-depth problem-oriented mathematical thinking without jeopardizing their thinking in either area (Chappell, 2003, pp. 290-291). One sees similar results at the high school level. The curricula evaluated we the Core-Plus Mathematics Project, Math Connections, the Interactive Mathematics Program (IMP), the SIMMS Integrated Mathematics Project, and the UCSMP Secondary School Mathematics Program. On standardized tests such as the CTBS or PSAT, there were no significant differences between student performance on the IMP, SIMMS, and UCSMP geometry curricula and traditional curricula; Core-Plus and MATH Connections students performed as well, if not better, than students from a traditional curriculum on standardized or state assessments. (Swafford, 2003, p.459.) When one turns to evaluator-developed measures of conceptual understanding or problem solving, students in all of these curricula outperformed students from traditional curricula. In sum: Taken as a group, these studies offer overwhelming evidence that the reform curricula can have a positive impact on high school mathematics achievement. It is not that students in these curricul[a] learn traditional content better but that they develop other skills and understandings while not falling behind on traditional content. (Swafford, 2003, p.468.) We shall return to the interestingly provisional language in the three summaries (reform-based mathematics curricula can work; Standards-based curricula may positively affect middle-school students mathematical achievement; the reform curricula can have a positive impact on high school mathematics achievement) presently. First, let us consider additional evidence on the effectiveness of the new curricula. A series of studies in Pittsburgh, PA (See Briars, 2001, Briars & Resnick, 2000, Schoenfeld, 2002b) documents what may be the most positive local implementation of a standards-based curriculum. Diane Briars, mathematics specialist for the Pittsburgh schools, had been conducting Standards-based professional development activities for some years when the Everyday Mathematics curriculum became available. Uneven implementation of the new curriculum in Pittsburgh provided the opportunity for a natural experiment a comparison of student performance in strong implementation schools where teachers implemented the curricula with strong fidelity with student performance in demographically matched schools where the new curricula were essentially ignored, and teachers implemented the prior, traditional curriculum. The Pittsburgh data document an across-the-boards improvement in test scores for the new curriculum on tests on sub-scores of skills, conceptual understanding, and problem solving. Indeed, some racial performance gaps were overcome with the new curricula. Because of the context, this is a somewhat idealized case but it indicates that when: a districts mathematics program is grounded in a rich, connected set of standards; the mathematics curricula used are consistent with the standards; assessments are consistent with the standards; teachers professional development is consistent with the standards; and there is enough systemic stability for sustained growth and change, there is the potential for substantial improvement in student performance, and for the reduction of racial performance gaps. Riordan & Noyce (2001) report on a series of comparison studies in Massachusetts. These studies, which used the statewide assessment (the MCAS) as the measure of performance, show that fourth and eighth graders using standards-based texts outperformed matched comparison groups who were using a range of textbooks commonly used in Massachusetts. These performance gains remained consistent for different groups of students, across mathematical topics and different types of questions on the state test (Riordan & Noyce, 2001, pp. 392-393). Reys, Reys, Lappan, Holliday &Wasman (2003) examined the impact of standards-based curricula on the performance of more than 2000 eighth grade students in three matched pairs of school districts in Missouri. The assessment used for the comparison was the state-mandated mathematics portion of the Missouri Assessment Program (MAP), which is administered annually to all Missouri eighth graders. The MAP assesses mathematical skills, concepts, and problem solving abilities as delineated in the State Mathematics Framework for. Students who had used standards-based materials for at least two years scored significantly higher than students from the districts that used non-NSF curricular materials. In the largest study conducted to date, the ARC Center (see ) an NSF-funded project, examined reform mathematics programs in elementary schools in Massachusetts, Illinois, and Washington. The study included more than 100,000 students. It compared the mathematics performance of students from schools implementing Standards-based curricula with a matched sample of comparison schools that used more traditional curricula. (Criteria for matching included reading level and socioeconomic status.) Results show that the average scores of students in the reform schools are significantly higher than the average scores of students in the matched comparison schools. These results hold across all racial and income subgroups. The results also hold across the different state-mandated tests, including the Iowa Test of Basic Skills, and across topics ranging from computation, measurement, and geometry to algebra, problem solving, and making connections. The study compared the scores on all the topics tested at all the grade levels tested (Grades 3-5) in each of the three states. Of 34 comparisons across five state-grade combinations, 28 favor the reform students, six show no statistically significant difference, and none favor the comparison students. (See .) There are a few additional studies comparing standards-based and traditional curricula, which will be considered in the discussion of the What Works Clearinghouse. But let us take stock at this point. Overall, there are a quite small number of studies that compare the two kinds of curricula. It is the case that the score sheet is uniformly in favor of the Standards-based curricula: virtually every study in the literature shows either no significant differences or an advantage to the standards-based curricula on measures of skills, and most show significant advantages to the standards-based curricula on measures of conceptual understanding and problem solving. However, the evidence base is embarrassingly weak. The vast majority of studies, like the majority of those reported in Senk & Thompson (2003), employed evaluator-developed measures of conceptual understanding and problem solving. These could be considered biased toward the curricula they evaluated. Little was said about the comparative conditions of implementation. Because beta versions of the standards-based curricula were generally being tested, one can assume that there was some implementation fidelity in the case of those curricula. In contrast, one knows little about implementation fidelity, or the overall quality of instruction, in the comparison classrooms. Hence the comparative studies can best be considered existence proofs about what the newer curricula can do (hence the provisional language in the summary chapters in the Senk and Thompson volume referred to above) rather than definitive comparative evidence. This point is made in very clear terms by a recent report of the National Research Council (2005). The What Works Clearinghouse Let us now turn to the evaluation effort conducted by the What Works Clearinghouse (WWC, at ). To quote from the front page of the WWC web site: On an ongoing basis, the What Works Clearinghouse (WWC) collects, screens, and identifies studies of the effectiveness of educational interventions (programs, products, practices, and policies). We review the studies that have the strongest design, and report on the strengths and weaknesses of those studies against the WWC Evidence Standards so that you know what the best HYPERLINK "http://www.whatworks.ed.gov/faq/what_research.html"scientific evidence has to say. WWC was established to address the kinds of issues discussed above the fact that there is a paucity of rigorous studies assessing the effectiveness of various kinds of interventions, ranging from mathematics and reading curricula to programs for dropout prevention. WWCs efforts are largely modeled on the Cochrane Collaborations efforts to develop evidence-based health care. (See http://www.cochrane.org/index0.htm.) The idea is not for WWC to conduct new studies, but to comb the literature for studies that meet its very stringent methodological criteria, to report on those studies, and ultimately to conduct meta-analyses regarding the effects of educational (and other) interventions. The WWC does not endorse any interventions nor does it conduct field studies. The WWC releases study, intervention, and topic reports. A HYPERLINK "http://www.whatworks.ed.gov/faq/what_are_reports.html#study"study report rates individual studies and designs to give you a sense of how much you can rely on research findings for that individual study. An HYPERLINK "http://www.whatworks.ed.gov/faq/what_are_reports.html#intervention"intervention report provides all findings that meet WWC Evidence Standards for a particular intervention. Each HYPERLINK "http://www.whatworks.ed.gov/faq/what_are_reports.html#topic"topic report briefly describes the topic and each intervention that the WWC reviewed. () The only kinds of studies considered for WWC review are studies that employ randomized controlled trials, regression discontinuity designs, and quasi-experimental designs with equating. If a study is of one of those types, it is then examined for possible flaws such as lack of implementation fidelity, differential dropout rates between groups, and such. (See for a list of criteria.) One can, legitimately, complain that the paradigmatic choices made by WWC are far too narrow: there are many ways to conduct informative studies of mathematics curricula, and the three kinds of studies potentially acceptable to WWC represent only a small part of that universe. (See the framework developed by the National Research Council (2004), discussed below). That critique notwithstanding, once can take the comparison studies on their own terms. The question is, what kinds of information does WWC, which is intended as a sort of consumers guide to curricula, actually provide? As discussed above, a negligible number of studies are of the desired types and meet WWCs stringent criteria. The first topic report produced by WWC, concerning middle school mathematics curricula, was produced in December 2004. Here is WWCs summary of the evidence base. From a systematic search of published and unpublished research, the What Works Clearinghouse (WWC) identified 10 studies of 5 curriculum-based interventions for improving mathematics achievement for middle school students. These include all studies conducted in the past 20 years that met WWC standards for evidence. The five curricula having at least one study of effectiveness that meets WWC standards for evidence (see below) include Cognitive Tutor, Connected Mathematics Project, The Expert Mathematician, I CAN Learn Mathematics Curriculum, and Saxon Math. The WWC identified 66 other studies that included evaluations of 15 additional interventions. Because none meets the WWC standards for evidence, we cannot draw any conclusions about the effectiveness of these other 15 interventions. The WWC also identified an additional 24 interventions that did not appear to have any evaluations. (What Works Clearinghouse, 2004a) These are indeed slim pickings. Moreover, they are controversial, and for good reason. As noted above, there are a wide range of studies other than randomized controlled trials, regression discontinuity designs, and quasi-experimental designs with equating that can provide valuable information about curricular effectiveness. Thus WWC can be accused of being far too narrow in its criteria for what counts as documented evidence of effectiveness. (See NRC, 2004, discussed below.) But even if one restricts ones attention to just the types of studies examined by WWC, the way in which WWC has chosen to report the studies that do meet its methodological criteria raises serious issues. Viadero (2004) described the controversy over one of those studies (What Works Clearinghouse 2004b), as follows: James J. Baker, the developer of a middle school mathematics program known as Expert Mathematician, is also dismayed at the way his research on the program is reported. His studythe only one that fully met the criteria for this topicused a random assignment strategy to test whether students could learn as much with this student-driven, computer-based program as they could from a traditional teacher-directed curriculum known as Transition Mathematics. The problem, he argues, is that the [WWC] web site said his program had no effect without explaining that students made learning gains in both groups. (p. 32) This issue is important in applied terms, for a study that says there were no significant differences due to the use of a particular curriculum may be taken by readers to mean that the curriculum in question had no beneficial impact. This problem can, of course, be can be resolved in a straightforward way. The summaries provided by WWC can be re-written to indicate the size of the gains made through the use of each curriculum. Another study report, however, WWCs (2004c) detailed study report of C. Kerstyns (2001) evaluation of the I CAN LEARN Mathematics Classroom, demonstrates what may be a fatal flaw in the nature of current WWC reports. Kerstyns study employed a quasi-experimental design with matching. It met the WWC standards with reservations; there were concerns regarding the implementation fidelity of the curriculum, some sampling issues, and issues regarding which subgroups of students were tested. The statistical reporting in the study fully meets WWC criteria, however. In discussing the measures used, the WWC report says: The fifth outcome is the Florida Comprehensive Assessment Test (FCAT), which was administered in February 2001. The author does not present the reliability information for this test; however, this information is available in a technical report written by the Florida Department of Education (2002). This WWC Study Report focuses only on the FCAT measures, because this assessment was taken by all students and is the only assessment with independently documented reliability and validity information. This is deeply problematic. Reliability and validity scores represent psychometric properties of the FCAT; they say nothing about the actual mathematical content of the examination. In other words, the report provides no information about the mathematics actually covered by the measure. As a result, the report cannot be interpreted in meaningful ways and it could be seriously misinterpreted. Consider the data given earlier in this section regarding students differential performance on the SAT-9 and the MARS examinations. Is the FCAT more like the former or the latter? What content does it emphasize? Does if focus on procedural knowledge, or does it demand some relatively sophisticated problem solving skills? Unless WWC provides an independent auditing of the examinations contents, it is impossible to say what students actually learned. This raises the possibility of individual false positives and curricular false negatives, as described earlier in this section. Moreover, not knowing what the outcome measures actually test makes it impossible to conduct meaningful meta-analyses of studies of the same curriculum. The author has urged WWC to re-do its analyses and to include content analyses of all assessment measures in its mathematics studies, so that readers of its study reports can determine what students actually learned. Unless and until the reports are re-done, the value of the entire enterprise is in question. How should one study curricular effectiveness? Determining whether and in what ways something as complex as a curriculum works is a complex matter. One view of the subject, rather different from that put forth by WWC, is offered by the National Research Councils (2004) committee for the review of the evaluation data of the effectiveness of NSF-supported and commercially generated mathematics curriculum materials. The committees report, which urges methodological pluralism, presents a broad-based framework for evaluating curricular effectiveness. The framework is reproduced (with permission, I hope) in Figure 1. The NRC framework is bipartite. The top part of the framework articulates a program theory  in essence, a description of what needs to be examined in the evaluation of an instructional program. In this framework, foci for examination include program components (including the mathematical content of the program and curricular design elements), implementation components (including resources, processes, and contextual influences), and student outcomes (including multiple assessment, enrollment patterns, and attitudes). The bottom part of Figure 1 represents the kinds of decision-making to be made by program evaluators. In any evaluation, there are methodological choices: What does one decide to look at, and how? The NRC panel points to three intellectually robust ways to examine curricula: content analyses, comparative studies, and case studies. It notes that there is a wide range of things to look at, and a wide range of rigorous ways in which such evaluations can be conducted. It points to the ways in which all of these kinds of studies can contribute to the fields collective understanding of curricular impact. The methodological pluralism of the NRC report stands in sharp contrast to the narrowly defined criteria employed by the What Works Clearinghouse.  Figure 1. Framework for evaluating curricular effectiveness. National Research Council (2005), p. 41. A proposal by Burkhardt & Schoenfeld (2003) stakes out a middle ground in terms of breadth and focus. The authors argue that consumers of educational materials would profit from having access to reports that describe the conditions under which curricula can be successfully implemented, and on the kinds of results one might expect under those conditions; they should also be warned about conditions that make it unlikely for a particular curriculum to succeed. Thus, both comparative studies and benchmarking studies (using a stable and rigorous set of standards and outcome measures) would help inform those who are faced with curricular choices. Burkhardt & Schoenfeld argue that the leap to experimental studies in education is premature. In both engineering and medical studies, research proceeds in stages. The first sets of studies typically include the design of prototypes (whether products or treatments) and the close observation of their effects under very controlled (and narrow) circumstances. This corresponds to design experiments (see, e.g., Brown, 1992; Collins, 1992; Cobb, Confrey, diSessa, Lehrer, & Schauble, 2003; Schoenfeld, in press) or alpha testing of curricula. The goals of such work are to understand what is happening: to develop theory and instruction in dialectic with each other, under greenhouse conditions. Once the phenomena are understood, it is time to broaden the range of conditions of implementation. Here the issue becomes: in what conditions does the treatment function, in what ways? Which factors shape the implementation, with what results? One engineering analogy among many is that some equipment is appropriate for rough terrain, while other equipment will function well on smooth but not rough terrain. Obviously, it is important to know this. Medical analogies are that one needs to discover how a medicine will be affected if it is taken with or without food, and whether the medicine interacts with other medicines or with particular conditions. Presumably there are factors that can affect the success of a curriculum in similar ways. What degree and kind of teacher professional development is necessary? How well is the curriculum suited for second language learners, and how can it be modified to make it more accessible if need be? What kinds of prerequisites are necessary? And more. The beta stage of curriculum study would consist of a planned series of observational evaluations of curricula in a carefully chose range of contexts: urban, suburban, and rural schools with a range of demographic factors, including the competency of the teacher corps, the amount of curriculum-specific professional development obtained by the teachers, the demographics of the student body, the availability and character of backup support for students, and so on. When these conditions are met that is, when one is in a position to say in a school or school district that looks like this, you should expect to provide these specific curricular supports, and then you can expect the following spectrum of results then one is ready to proceed to the most informative kinds of wide-spread experimental or comparative (gamma stage) testing. To sum up, the state of the art is still somewhat primitive. Much needs to be done along the lines of instrumentation (the development of robust outcome measures covering a wide range of expected mathematical content and processes), the creation of observational protocols, and the conduct of the wide range of studies described in On Evaluating Curricular Effectiveness (National Research Council, 2004). The challenges are not necessarily theoretical, although some theoretical work will need to be done; rather, this is in large measure a challenge of instrumentation, incentives, and implementation (Burkhardt & Schoenfeld, 2003). Equity and Diversity in Mathematics Education This topic area and the next, Learning in Context(s), are deeply intertwined, in that they both cross borders of classroom and culture. The division between the two is thus somewhat arbitrary. The same is the case for any separation between mathematics education and education writ large concerning these issues. For example, while the conditions of poverty described in Kozol (1992) unquestionably contribute to racial performance gaps in mathematics (see, e.g., J. Lee, 2002; Schoenfeld, 2002b; Tate, 1997), they contribute to performance differences in other fields as well. Hence in this section and the next, I will sketch the larger surround and then point to particular pieces within mathematics education. The issues here are especially complex, because they cross traditional disciplinary boundaries as well. Many fields have something to say that informs our collective understanding of, for example, why different ethnic, racial, socioeconomic, linguistic, and gender subgroups of the population perform differently on a wide range of measures. However, while each casts some light on the phenomena, the illumination is partial and the underlying theoretical perspectives are often different. Consider, for example, the issues raised in Paul Willis classic (1977/1981) book Learning to labor:How working class kids get working class jobs. Willis makes it clear that issues of identity are central to ones participation (or not) in school practices. In Williss case, the students examined defined their personal affiliations along class lines. Those affiliations shaped their interactions with schooling and thus, in large measure, the outcomes. Nothing in Williss book is specific to mathematics classrooms. Yet, it clearly applies, at least in broad-brush terms: the students identities shape their participation in all classrooms, including mathematics. Consider as well the econometric analyses of the contributions of schooling and parental economic status to peoples economic success found in Bowles and Gintis classic (1976) volume Schooling in Capitalist America: Educational Reform and the Contradictions of Economic Life. This says something, at least in correlational terms, about mathematical performance. The grand theoretical issue is how to meld such theoretical perspectives, and other powerful perspectives, into or with the sociocultural and cognitive perspectives that now predominate in discipline-oriented fields such as mathematics education. This is not merely a matter of one perspective subsuming another, or of foregrounding and backgrounding. The challenge is to build a theoretical and empirical program that provides leverage for the examination and explanation of the phenomena that are considered central to each of the constituent perspectives. Varied theoretical perspectives on the issue of diversity in particular were framed by Greeno, Collins, and Resnick in the previous issue of this Handbook as follows: Consider issues of valuing diversity among students. The behaviorist perspective suggests a focus on equity of access and opportunity to acquire valued knowledge and supports development of practices that ensure that all students can achieve a satisfactory level of basic knowledge. The cognitive perspective suggests a focus on differences among students in their interests and engagement in the concepts and methods of subject matter domains, in the understandings that they bring to school activities, and in their learning strategies and epistemological beliefs, and supports development of practices in which these multiple interests, understandings, and approaches are resources that enrich the educational experiences of all students. The situative perspective suggests a focus on school learning as the activities of communities of practice whose members the teachers and students are participants in many communities outside of school, and whose main function is to help prepare students for satisfying and effective participation in the multiple communities of the society in their later lives. This perspective encourages the development of social arrangements in school that can reinforce and complement students family and other nonschool social communities and development of the students; and teachers identities through meaningful participation in social and professional communities that create and use subject matter knowledge. (Greeno, Collins, and Resnick, 1996, pp. 40-41) That framing presages the content of this section, and to some degree, the next. This section begins with a brief reprise of data indicating the reasons that equity and diversity have been, and remain, major concerns. It then discusses a series of efforts within mathematics education to redress some of the inequities documented by the literature. It concludes with a discussion of a theoretical reconceptualization of these issues offered by Cobb and Hodge. Statistics on what have come to be known as racial performance gaps can be found in J. Lee (2002), National Science Foundation (2000), and Tate (1997). As is well known, when data on in mathematics course-taking, course grades, high school graduation rates, scores on national examinations such as the SAT, are college enrollments are disaggregated by racial or ethnic groups or by socioeconomic status, one sees persistent and substantial differences to the disadvantage of Latinos, African Americans, Native Americans, and children of low socioeconomic status. The differences are consequential. These are the words of noted civil rights leader Robert Moses: Today the most urgent social issue affecting poor people and people of color is economic access. In todays world, economic access and full citizenship depend crucially on math and science literacy. I believe that the absence of math literacy in urban and rural communities throughout this country is an issue as urgent as the lack of Black voters in Mississippi was in 1961. (Moses & Cobb, 2001, p. 5) In brief, Moses argument is that a lack of mathematical and scientific literacy leads to economic disenfranchisement. Moses approach to the problem, called the Algebra Project and described in Moses & Cobb (2001), is focused on providing mechanisms of mathematical enfranchisement for students. The project began by providing students with a set of empirical experiences that served as a basis for internalizing certain mathematical notions for making them personally meaningful, so that mathematical formalization (via a process called the regimentation of ordinary discourse motivated by the ideas of the philosopher and mathematician Willard Van Orman Quine) became the codification of personally meaningful experiences rather than a set of instructions for operating on abstract symbolic structures. This idea of rooting mathematics in personally meaningful experiences lies at the core of work done in the Algebra Project. But, the project goes far beyond that. Moses goals are ultimately those of the civil rights movement. It was when sharecroppers, day laborers, and domestic workers found their voice, stood up and demanded change, that the Mississippi political game was really over. When these folk, people for whom others had traditionally spoken and advocated, stood up and said, We demand the right to vote, refuting by their voices and actions the idea that they were uninterested in doing so, they could not be refused To understand the Algebra Project you must begin with the idea of our targeted young people finding their voice as sharecroppers, day laborers, maids, farmers, and workers of all sorts found theirs in the 1960s. (Moses, 2001, p. 20) Thus, in Moses view (but in this authors interpretation and phrasing), issues of voice, issues of entitlement, issues of responsibility, and issues of identity are all central concerns when considering enfranchisement in mathematics. This perspective is shared in various ways by a number of authors who view mathematics through a social justice lens. Martin (2000; in press), for example, identifies an aspect of identity that he calls mathematics identity. Mathematics identity refers to the dispositions and deeply held beliefs that individuals develop about their ability to participate and perform effectively in mathematical contexts (i.e., perceived self-efficacy in mathematical contexts) and to use mathematics to change the conditions of their lives. A mathematics identity therefore encompasses how a person sees himself or herself in the context of doing mathematics (i.e. usually a choice between a competent performer who is able to do mathematics or as incompetent and unable to do mathematics). (Martin, in press, p. 10) Martin (2000) presents case studies of under-represented minority students who succeed in mathematics at school while the vast majority of their peers do not. His work indicates that those students tend to have a sense of personal agency (closely related to their mathematical identities) that has them act in ways that, at times, defy the norms and expectations of their peers and others. Martins research also indicates, in the same ways that Shirley Brice Heaths (1983) study of literacy patterns does, that membership in different subpopulations (or perhaps subcultures) of the population at large tends to provide very different affordances for participation in school practices. Martin (in press) expands upon these ideas by considering, in the case of African Americans, the potential conflicts between ones mathematics identity and ones racial identity: for [the subject of his study] and other African Americans like him, there is often a struggle to maintain and merge positive identities in the contexts of being African American and being a learner of mathematics. This struggle is brought on by a number of forces that racialize the life and mathematical experiences of African Americans. Martins language, while somewhat different from Wengers (Wenger, 1998), is entirely consistent in theoretical terms. Wenger writes in terms of an individuals (unitary) identity a work in progress, shaped by both individual and collective efforts to create a coherence in time that threads together successive forms of participation in the definition of a person (p. 158). Wenger stresses that: We all belong to many communities of practice, some past, some current; some in more peripheral ways. Some may be central to our identities while others are more incidental. Whatever their nature, all these various forms of participation contribute in some way to the production of our identities. As a consequence, the very notion of identity entails an experience of multimembership the work of reconciliation necessary to maintain one identity across boundaries. (Wenger, 1998, p. 158) If one reads Martins mathematics identity and racial identity as aspects of one larger identity, then one sees Martins case studies as cases in point for Wengers theoretical claims. And, to be explicit: just as participation in communities of practice has ramifications for ones construction of identity, ones identity shapes patterns of participation. Hence the issue of multimembership in different communities of practices, and the affordances each community offers for the individual, are central. Are the practices that constitute or signal membership in one community (say the mathematics classroom) consistent with those of another community that is central to ones identity (say ones home life, or peer group)? Do they build on ones perceived strengths, or do they negate or undermine them? Some of the most promising empirical and theoretical work is grounded in these underlying perspectives. There is, for example, the idea that students have funds of knowledge (Gonzlez, Andrade, Civil, & Moll, 2001; Moll, Amanti, Neff, & Gonzlez, 1992; Moll & Gonzlez, 2004) upon which school knowledge can be built and expanded, rather than having deficits that need to be remediated. This perspective is also powerfully demonstrated in work by Carol Lee (C. Lee, 1995) and explicated by Gutirrez and Rogoff (2003). There is the related idea that culturally responsive pedagogy (Ladson-Billings, 1994, 1995) meets the whole child and creates a classroom community of students who feel and are empowered to learn. In various ways, these underlying perspectives are represented in analyses by Brenner (1994; Brenner & Moschkovich, 2002), R. Gutierrez (1996; 2002), Khisty (1995; 2002), and Moschkovich (1999; 2002; in press). Empirically, they are embodied in a number of powerful attempts at teaching mathematics or science for social justice. One of the longest established and best-known programs is Chche Konnen. The project describes itself as follows: The Center conducts research on learning and teaching in urban classrooms and on teacher inquiry as a form of professional development. A cornerstone of this work is documentation of the sense-making resources that children from ethnically and linguistically diverse backgrounds bring to the study of science (e.g., the oral and literate traditions they command in their daily lives outside of school) and the ways these intersect with those characteristic of scientific disciplines. In line with this, the Centers work is guided by the following principle: All children have a great deal to learn from one another. Those who typically do not excel in academic disciplines have as much to teach as do children who typically do excel. (http://chechekonnen.terc.edu/, downloaded March 17, 2005) A series of research papers from the project (Rosebery, Warren, & Conant, 1992; Rosebery, Warren, Ogonowski & Ballenger, 2005; Warren, Ballenger, Ogonowski, Rosebery, & Hudicourt-Barnes, 2001; Warren & Rosebery, 1995) documents the ways in which Chche Konnen capitalizes on the skills and understandings students bring to the and engages them in substantive scientific inquiry and discourse. A second series of papers with a social justice focus in mathematics comes from Gutstein and colleagues (Gutstein, 2003, 2005; Gutstein, Lipman, Hernndez & de los Reyes, 1997). Gutstein takes direct aim at issues of social justice and at empowering students as advocates for themselves and their communities by assigning projects that use mathematics to address social injustices. Gutstein (2005) describes his pedagogy of questioning as follows: [Early in the year] I gave my students a mathematics project titled Cost of the B-2 BomberWhere Do Our Tax Dollars Go? The essence of the project was for students to compare the cost of one B-2 bomber (about $2.1 billion, with all development costs) to a four-year scholarship (including room, board, and books) at the University of WisconsinMadison, a prestigious out-of-state university, and to determine whether one bomber could pay for a four-year scholarship for the whole graduating class of the neighborhood high school (250 students). Students also had to find out for how many years the money for one bomber would pay for four-year scholarships for the whole graduating class (79 years!), assuming constant costs and number of students per year. This was the first of several real-world projects (as I call them) in which students used mathematics as a principal analytical tool to investigate social justice issues that were meaningful to them. These projects often emerged, either directly or indirectly, from students own questions or from things that were on their minds. (Gutstein, 2005, p. 2.) Gutstein and others teaching for social justice recognize that they, like anyone teaching a somewhat non-standard mathematics class, are the servants of at least two masters. They will be held accountable for their students performance on standard mathematical content, and then for whatever additional goals they have for instruction. Thus, Gutstein (2003) provides evidence of his students mathematics learning according to traditional, standardized measures. He also provides evidence of his students empowerment of their eagerness after his course to use their mathematical knowledge to address issues of social justice. A third example, Railside School, will be discussed in the next section. But, it is worth noting here as an exemplar of a coherent attempt on the part of a high school mathematics department to create a culture, both for staff and for students, that supports a strong equity agenda. Boaler (in press) describes her findings as follows: At Railside School, an urban school in which the population of students was more diverse and of a lower SES than the other two schools, students achieved more, enjoyed mathematics more and stayed with mathematics to higher levels. In addition the achievement differences that were in place between students of different ethnic groups at the beginning of high school were reduced in all cases and disappeared in some. For example, at the beginning of high school white students were achieving at significantly higher levels than Latino students but such differences disappeared by the end of the second year of high school. (Boaler, in press, p. 1) Such results were possible because of a department-wide effort that focused: on a curriculum that allowed all students to engage with meaningful mathematics; a pedagogy grounded in the assumption that all students are capable of grappling meaningfully with mathematically rich problems, and have something to contribute to their solution; as part of that pedagogy, a set of classroom accountability structures that hold students accountable to each other and to the teacher for very high standards of mathematics; and a number of mechanisms for supporting the teachers in implementing the pedagogy just described. (Boaler, in press; Horn, 2003.) Each of the efforts described in this section, in different ways, considers individual learners as members of a number of different communities and as participants in different Discourses (in the sense of Gee, 1996) associated with each of those communities; each is concerned with continuities and discontinuities between those communities and the Discourses in them. In various ways, the educational efforts try to bridge the discontinuities. This interpretation of these efforts is consistent with an important re-framing of the issues of diversity and equity put forth by Paul Cobb and Linn Liao Hodge in a seminal piece entitled A relational perspective on issues of cultural diversity and equity as they play out in the mathematics classroom (Cobb & Hodge, 2002). One version of the standard notion of diversity might be as follows: the diversity of a group is related to the number of members of the group who come from different ethnic/racial/socioeconomic/gender/sexually-oriented/other subgroups of the general population. Cobb and Hodge offer the following provisional, potentially revisable framing: We propose to conceptualize diversity relatively broadly in terms of students participation in the practices of either local, home communities or broader groups or communities within wider society. Equity as we view it is concerned with how continuities and discontinuities between out-of-school and classroom practices play out in terms of access (Cobb & Hodge, 2002, p. 252). Cobb and Hodges perspective and the standard notion can result in different views of the diversity of a particular group. A recent example of the difference in the two characterizations and their entailments came in series of news articles about the town of Cupertino, a wealthy enclave in Silicon Valley that has very high-performing schools and real-estate values to match. The town was characterized in the media as diverse. It is, in the standard sense: the town is populated by Whites and a wide range of (mostly Asian) ethnic minorities. Cobb and Hodges characterization provides an alternative view. Part of the reason Cupertinos schools do as well as they do is that parents with particular sets of values and practices (and the incomes to back them up) comprise a huge majority of the towns inhabitants. In that sense there are relatively few discontinuities between some important in-school and out-of school practices for the children who attend school the district i.e., not tremendously much diversity along some of the main dimensions that count in this context. A shift to Cobb and Hodges characterization of diversity has some slight drawbacks but also some potentially significant advantages. One disadvantage of the definition is that it obscures the traditional focus on the differential treatment of different subgroups of the general population e.g., the data on racial performance gaps that make so tangibly clear the inequities of our educational system. On the flip side, however, this kind of definition takes a significant step away from the stereotyping and essentializing that often come as an entailment of classification the idea that members of any particular ethnic, racial, socioeconomic, gender, or other group all share important attributes by virtue of their membership in that group, and therefore can be pigeonholed and treated in ways appropriate for members of those groups. The main advantage of the shift in perspective, however, may be its shift in focus. Learning is a concomitant of the practices in which we engage. Hence a focus on the opportunities that various contexts provide to individuals to engage in particular kinds of practices provides a central lens on learning. The opportunities available to each individual are clearly a function of the continuities and discontinuities between the practices of the different communities in which that individual is a member. This framing, thus, is a potentially useful lens with which to view all of learning. It leads us to the next section of this chapter. Learning in Context(s) This section focuses directly on the issue of learning. Somewhat more than a quarter century ago, the field of cognitive science began to coalesce. Its emergence as an interdisciplinary enterprise was motivated in large part because its varied constituent disciplines among them anthropology, artificial intelligence, education, linguistics, neurobiology, philosophy, and psychology all offered partial views of a phenomenon (cognition) that was too big for any one of them to grasp individually. As a result of that coming together, tremendous progress has been made over the past few decades. That progress can be seen in the flowering of understandings and results described in the two editions of this Handbook. The outlines of individual pieces of the puzzle of learning are beginning to become clear. But, how they fit together is still at issue. This section describes some of those pieces, and some of what remains before they can be put together. It begins with some brief additional commentary on the character of the puzzle, and then works its way down from the big picture to more fine-grained issues of mechanism, and an evaluation of the state of the art. The issue is how to put things together how to see everything connected to an individual (both internally in the sense of knowledge, identity, etc., and externally in terms of that persons relationship to various communities) and the communities to which the individual belongs as a coherent whole. Ideally, one would like to be able to understand the evolution of individuals and communities as well. Obviously, there are issues of grain size: some phenomena are macro and some macro, and different explanatory lenses (local theories) will be appropriate for focusing in on different levels. But, the linkages should be smooth, in the same sense that (for example) a big picture theory of ecosystems should frame the discussion of the ecology or a particular region, establishing the context for a discussion of the evolving state of classes of organisms in that region; a more micro view of a specific class of organisms in that region describes how they live in interaction with that region; and yet more micro analyses describe the anatomy and physiology of individual organisms (and so on). I consider one broad metaphor before returning to mathematics education. It is in the tradition of an early paper by Greeno (1991), which compared learning in a content domain (and the affordances of various symbolic and physical tools therein) with learning to make ones way comfortably around a physical environment. Learning the domain . . . is analogous to learning to live in an environment: learning your way around, learning what resources are available, and learning how to use those resources in conducting your activities productively and enjoyably." (p. 175). . . "In [pursuing] the metaphor of an environment such as a kitchen or a workshop, this section is about knowing how to make things with materials that are in the environment. . . ." (p. 177) Motivated by Greenos metaphor and a passion for food, the author (Schoenfeld, 1998b) pursued some parallels between learning to cook and learning mathematics, e.g., the development of skills and the ability to perceived and take advantage of affordances in the environment, and the character of memory and representation in the two domains. Here I would like to pick up the metaphor, in terms of the big themes introduced in this chapter e.g., the relationships between identity, knowledge, and community, and how each can be foregrounded and explored in ways that lead continuously from one to the other. To put things simply: being a foodie, like being a mathematician and being an educational researcher, is part of the authors identity. Manifestations of that aspect of the authors identity are easy to spot, both materially and personally: materially in his well-equipped kitchen and in a large collection of cookbooks and of restaurant guidebooks, personally in his ongoing practices (taking pains to prepare meals, stopping off at specialty stores to buy provisions for dinner, using food metaphors in his research group, and occasionally mixing his food and work identities by writing about both). If one were interested in understanding these aspects of the authors identity, his personal history would be clearly important; so would membership in various (sometimes distributed, but clearly defined) communities and the role they played not only in the development of identity but in the development of skills and understandings. Deeply intertwined with identity is a body of skills and knowledge his knowledge that particular dishes are best made in particular kinds of pans, that a particular preparation calls for a blazingly hot pan while another calls for gentle heat; his knowing (by sight, or feel, or other input) when a particular stage in the cooking process is done; and more. Call this a knowledge inventory if you will; the fact is that no description of the author as cook is complete without a thorough categorization of the set of skills, practices, and understandings he possesses (cf. Hillman, 1981; McGee, 2004). This can be done, more or less in standard cognitive science tradition. What is called for in theoretical terms is specifying the linkage between the authors identity and knowledge base. One can imagine ways to specify the linkage: narrative stories of the protagonists enjoyment of food; descriptions of familial and other practices that enhanced that enjoyment; a characterization of the support he had in developing various culinary practices, on his own and in interaction with others; and the details of that support structure and those interactions, which gave rise to the entries in the knowledge inventory and the coherence among them. This set of issues explaining and linking aspects of identity, participation, and knowledge is by analogy the set of issues one confronts when trying to paint the big picture in (mathematics) learning as well. A recent paper by Saxe and Esmonde (in press) takes on some of the large-scale issues related to the dialectic shaping, over time, of relationships between individual and community. In a distillation of research that includes field studies conducted in 1978, 1980, and 2001 and a historical analysis that covers 1938 to the present, Saxe and Esmonde examine the micro- and macro-changes in the counting systems used by inhabitants of the Oksapmin valleys in the highlands of central New Guinea. In the mid-20th century, the Oksapmin people used a body part counting system, counting digits and pointing to different places on their bodies. By the time of Saxes first visit in 1978, commercial incursions from the West had put pressure on the indigenous people to switch (at least in some interactions) from a trade-based economy to a cash-based economy involving Western currency such as pounds and shillings. The effects of those changes were recorded in Saxes early work. When he returned in 2001, he saw further changes in the body count system. Saxe and Esmonde (in press) present an analytic framework to guide their analyses of the interplay between the social history of the Oksapmin and the development, over time, of new forms of mathematical represent5ation and thought. The framework is fundamentally cultural; it is also fundamentally developmental. The authors present intertwined arguments at three levels: microgenetic, sociogenetic, and ontogenetic. Microgenetic analyses show the ways in which individuals turn cultural forms like the body system into means for accomplishing representational and strategic goals (p. 65). Sociogenetic analyses focus on the ways in which such changes become part of a community. The argument is that (as with some theories of language development) at first the new developments are synchronic, developing locally in a variety of locations (in this case, in trade stores, where the Western currency began to displace the body count system). Later the process of change is diachronic (taking place over a longer time interval), as interlocutors from different sites encounter each other and need to negotiate shared meanings. Finally, there is the issue of ontogenesis, used here to mean changes in the organization of cognition over the course of an individuals life span. Interviews with individuals at least suggested a longitudinal progression of conceptual growth. The work by Saxe and Esmonde addresses some of the same issues, though from a somewhat different perspective, that are addressed by Engestrm (1987, 1993, 1999). Engestrms activity-theoretic framing of the issues situates individual activities amidst a nexus of complex social structures, highlighting the tensions negotiated by individuals and communities over time. This theoretical structure was used by K. Gutirrez, Baquedano-Lopez, & Tejeda (1999) to explore what they call third spaces, zones of development that can open up within classrooms to accommodate productive activities by diverse sets of learners. As noted in the previous section, Wenger (1998) provides a theoretical framework that focuses on issues of practice(s) and (aspects of) identity, and the dialectic relationships between them. Issues of identity are explored in interesting ways by Nasir and Saxe (Nasir, 2002; Nasir & Saxe, 2003). Drawing upon Wengers (1998) and Saxes (1999) frameworks, Nasir (2002) illustrates the ways in which individuals change as they engage in the practices of playing dominos and basketball. Her analyses indicate that as individuals become more accomplished, their goals change; their relationships to the communities of practice (domino and basketball players) change; and their own definitions of self relative to the practices change. Nasir illustrates the bidirectional character of relations between identity, learning, and goals. (Learning creates identity, and identity creates learning; and so on.) Nasir & Saxe (2003) examine different facets of identity ethnic identity and academic identity and point to circumstances in which the two may be in conflict. The issue of contrasting grand theories has been discussed at length, and will not be reprised here. A useful collection of papers summarizing the contributions of various theoretical approaches to thinking, teaching, and learning in mathematics education can be found in Kilpatrick, Martin, & Schifter (2003). A section of that volume entitled Perspectives on teaching and learning offers four perspectives: cognitive science (Siegler, 2003), situative research (Greeno, 2003), a sociocultural approach (Forman, 2003) and an eclectic and provocative review by Sfard (2003). As noted in the previous section, Cobb and Hodge (2002) offer a theoretical framing of issues related to the continuities and discontinuities between practices in which individuals engage, inside the classroom and outside, that serves as a useful lens with which to examine all learning (not just issues of diversity). Much of the work in the previous section of this paper is grounded in, or at least consistent with, this perspective. Let us now focus more directly on the mathematics classroom. At the broad level of linking practices to outcomes, Boaler (2002; in press; Boaler & Greeno, 2000) has identified the characteristics of different communities of classroom mathematical practice and their impact both on student performance and on aspects of identity. In her book Experiencing School Mathematics, Boaler (2002) describes two very different environments. Amber Hill was the very embodiment of exemplary traditional mathematics instruction. It had hard-working and professional teachers, a clearly specified curriculum (the English National Curriculum), and a straightforward, department-wide approach to instruction. There was a very high rate of time on task as Amber Hill students watched teachers model the solutions to problems at the blackboard, and then worked collections of problems on worksheets. Phoenix Park school had a population similar to Amber Hill in terms of demographics, but a radically different approach to mathematics instruction. The curriculum was problem-based, with little emphasis on drill. One problem, for example, was for students to find as many shapes as they could whose volume was 216. Once the problem was assigned, teachers then worked with individual students, tailoring the problem to the students needs and skills. Students had a great deal of autonomy, and time on task was very low at times. Boaler used multiple measures to determine the outcomes, in the aggregate and by way of individual descriptions. In the aggregate, there were few differences on skills-oriented tasks between students at the two schools but there were differences in perspective. Students at Amber Hill felt qualified only to solve problems that were nearly identical to problems they had worked, and they were uncomfortable at times even with that. In the examination and applied assessments, students were forced to look for cues because they had no other way of knowing what to do. They were not prepared to interpret the mathematical demands of the situations, and the had not learned what different procedures meant or how they might adapt or change them if necessary S: Youve got to just like a computer, youll do it, but when you get the answer you wont be sure that its right, if its like, youll be like this is how we learnt it, but is this the answer? Youre never certain. (Boaler, 2002, p. 122) In contrast, at Phoenix Park, The students were given little structure and guidance, and although many spent long periods of time off task, when they were working they needed to be thinking. It was almost impossible for the students to switch off and work in a procedural way when they were planning and developing their projects. For some students, this was the most important difference between their bookwork and their project work: G: In books it more or less explains everything to it, but Id rather work it out for myself by looking at it and working it out or getting the teacher to talk to you about it, instead of telling you exactly what to do. (Boaler, 2002, p. 122) Similar patterns were found in American schools studied by Boaler and Greeno (2000). In the ecologies of didactic teaching, students viewed their roles vis--vis mathematics as passive memorizers; in the ecologies of discussion-based teaching, students are active collaborators and co-constructors of knowledge: J: The teacher gives us something and has us work on a work sheet, because if I understand something, then I can explain it to the group members or if I dont understand it the group members may explain it to me. Whereas if she teaches the lesson and sends us home with it, Im not really that confident because I havent put like things together (Boaler & Greeno, 2000, p. 178). Boaler (in press) pursues this issue in more fine-grained detail, examining the accountability structures by which the teachers at Railside School hold students, and the students hold each other, accountable for producing clear and cogent explanations of the mathematics under consideration. In a lesson described by Boaler (in press), one member of a group is asked a question by the teacher. When the student does not produce a viable explanation, the teacher simply says Ill be back. The group knows the teacher will return to ask the same student the same question again. One member of the group gives the student a quick tutorial, saying answer it this way. But the student resists. She argues that the teacher will not be satisfied with a pat answer that the teacher will probe until the student produces an explanation that is mathematically correct and stands up to robust questioning. It is the groups responsibility to make sure every member of the group understands and can explain the material. The group takes on that responsibility, with the result that the student does come to understand the material and, after demonstrating her understanding of it (withstanding tough questioning from the teacher), she is clearly more self-assured as well. In the classroom videotapes from Railside one sees, at a micro-level, the ways in which classroom practices interact with issues of individual identity and knowledge. The examples given above are cases in point for an argument by Engle and Conant (2002), that there are substantial consistencies in some of the most productive learning environments for students: Problematizing: students are encouraged to take on intellectual problems Authority: Students are given authority in addressing such problems Accountability: Students intellectual work is made accountable to others and to disciplinary norms Resources: Students are provided with sufficient resources to do all of the above. (Engle and Conant (2002, pp. 400-401). The discussion of the Railside example also brings us explicitly to the issue of mechanism the means by which the dialectic between individual and collective is worked out, with each being shaped as a result. Central to the study of classroom practices, of course, is the study of patterns of classroom discourse. There are at least two useful theoretical notions involved in the discussion of the Railside classroom above. The first is sociomathematical norms. Erna Yackel and Paul Cobb (Cobb & Yackel, 1996; Yackel & Cobb, 1996) adapted the concept of general social norms to describe situations that specifically involve patterns of taken-as-shared mathematical behavior: Normative understandings of what counts as mathematically different, mathematically sophisticated, mathematically efficient, and mathematically elegant are sociomathematical norms. Similarly, what counts as an acceptable mathematical explanation and justification is a sociomathematical norm. To further clarify the subtle distinction between social norms and sociomathematical norms we offer the following examples. The understanding that students are expected to explain their solutions and their ways of thinking is a social norm, whereas the understanding of what counts as an acceptable mathematical explanation is a sociomathematical norm (Cobb & Yackel, 1996, p. 461) The second closely related notion is that of accountability structures. In the Railside classroom studied by Boaler, the students are accountable to the teacher, to each other (in that the group is responsible for making sure that all of its members understand the mathematics), and to the mathematics their discussions and explanations are expected to be rigorous and to meet high mathematical standards. Ball and Bass (2003b) provide examples of ways in which a third grade class, over the course of the school year, comes to grapple with such issues. Horn (in preparation) provided a fine-grained analysis of the accountability structures in Deborah Balls well known January 19, 1990 class. Some of the critical aspects of what Horn calls accountable argumentation are that: it uses terms from the mathematical and academic registers (e.g. proof, conjecture); discussions have a slow and measured pace; and, disagreements are important and may not (and need not) be resolved. Horn argues that In this classroom, accountable argumentation brings the often hidden practices of mathematical reasoning into the visible world of classroom interactions The structure provided by accountable argumentation helps make disagreements intellectually productive in several ways: by providing support for "thinking activities", by supporting deep engagement with specific ideas, and by supporting the learning and creating of new mathematics. Two norms of accountable argumentation, in particular, support thinking activities in the classroom: the use of terms from the mathematical and academic registers, such as proving and conjecturing, and the norm of a slow and measured pace of discussions that permit such activity to take place. During the class session, these thinking activities are focused on a particular set of ideas. Accountable argumentation supports engagement with specific ideas, particularly through the expectations that (a) students attend to whole class discussions and (b) students take a justified position in a discussion which they will act on or defend. In addition, once they are engaged in a disagreement, the stakes for engagement increase. Dissenters are obliged to ask questions or otherwise substantiate their position to their peers. Principals, on the other hand, must articulate their thinking to the whole class. Effectively, these thinking activities and the engagement in particular ideas support both the learning and creation of mathematics. (Horn, 2005, p. 25) At an equally fine level of grain size, and also focusing on issues of mechanism, are studies of teachers discourse moves such as those conducted by OConnor (1998) and OConnor and Michaels (1993; 1996). OConnor and Michaels characterize a teacher move they call revoicing. In revoicing, a teacher picks up on a comment made by a student and draws attention to it sometimes paraphrasing, sometimes clarifying, sometimes commenting on its relevance or importance. This act can legitimate and give status to a student; it can bring his or her ideas to center stage; it can position the student as author of the comment and place the student at the center of a dialogue, to which other students are expected to participate. All of these moves can contribute to the creation of a classroom discourse community in which students are given authority to work on consequential problems, positioned as knowledgeable members of the community, and attributed ownership of important ideas. This kind of discourse move on the part of teachers stands in stark contrast to traditional classroom discourse communities in which the teacher typically initiates discussion with a short answer question, a student responds, and the teachers evaluates the response (IRE sequences; see Mehan, 1979). Also at the level of mechanism, there is the question of what actually takes place in extended (and not always productive) interactions between students. Sfard and Kieran (2001) present a detailed analysis of a series of interactions between two 13-year-old boys learning algebra over a two month period. They introduce the notions of focal and preoccupational analyses as analytical tools the former for giving direct attention to the mathematical content contained in students interactions, and focusing on communication and mis-communication between the two students, the latter focusing on meta-messages and engagement, providing tentative explanations for some of the students communication failures. The authors note their conclusions as follows: We realized that the merits of learning-by-talking cannot be taken for granted. Because of the ineffectiveness of the students communication, the collaboration we had a chance to observe seemed unhelpful and lacking the expected synergetic quality. Second, on the meta-level, we concluded that research which tries to isolate cognitive processes from all the other kinds of communicative activities is simply wrongheaded For us, thinking became an act of communication in itself. This re-conceptualization led to the disappearance of several traditional dichotomies that initially barred our insights: the dichotomy between contents of mind and the things people say or do; the split between cognition and affect, and the distinction between individual and social research perspectives. (Sfard & Kieran, 2001, p. 42) This latter issue is also pursued in Sfard (2001). Finally, there is a need to understand classroom discourse practices and the use of artifacts and the development of shared meanings over both. A fascinating exercise in multiple interpretation was carried out in Sfard & McLain (2003). Sfard and McClain were guest editors of a special issue of the Journal of the Learning Sciences, in which a series of authors with related but different theoretical perspectives examine the same set of video-recorded classroom data from an experiment in teaching statistics conducted by Paul Cobb, Kay McClain, and Koeno Gravemeijer. The special issue includes a CD with the full text of the journal issue and embedded segments of video, permitting the journal audience close access to the objects of analysis. The juxtaposition of theoretical perspectives in the issue shows the progress the field has made in untangling social-cognitive phenomena. See also Sfard (2000), which provides a detailed examination of how symbols come to take on meanings. To sum up, all of the studies referenced in this section offer advances over the perspectives and tools available to the field when the previous edition of the Handbook of Educational Psychology was published. As the field has matured, it has begun to grapple with complex issues of learning in context(s). The studies referenced here represent points of light in territory that, not long ago, was largely uncharted. As such, there is progress. There is not enough light to illuminate the terrain; but there may be enough points of light to allow one to get a sense of the landscape. The state of the field. The main substance of this chapter has delineated thematic progress in a number of domains central to mathematics teaching and learning: research focusing on issues of teacher knowledge and aspects of professional development; issues of curriculum development, implementation, and assessment; issues of equity and diversity; and issues of learning in context(s). This brief concluding section takes a step back from the details to examine the contextual surround within which researchers in mathematics education do their work. As this chapter indicates, there has been a fair amount of theoretical progress with the theory being grounded in, and tested by, empirical findings. However, this steady progress has not been met with recognition or support outside the field; and research has not had nearly the impact on practice that it might. Moreover, the external context (including the funding environment) for high quality research in mathematics education is as hostile as it has been for at least a quarter century. Some of this is undoubtedly the control of the field, but (mathematics) educators may have contributed to some of it them/ourselves. The political context Educational research as a whole in the United States is under attack. Consider, for example, the following language from the U.S. Department of Education's Strategic Plan for 2002-2007: Unlike medicine, agriculture and industrial production, the field of education operates largely on the basis of ideology and professional consensus. As such, it is subject to fads and is incapable of the cumulative progress that follows from the application of the scientific method and from the systematic collection and use of objective information in policy making. We will change education to make it an evidence-based field. < HYPERLINK "http://www.ed.gov/pubs/stratplan2002-07/index.html" http://www.ed.gov/pubs/stratplan2002-07/index.html, p. 48> That language does not represent an empty threat. Evidence-based has been taken to mean quantitative, and a narrow band of quantitative at that; sources of funding for anything other than a narrow, quantitative research agenda are drying up (see below). Funding Funding for educational research has always been ridiculously low. In 1998 the U. S. House Committee on Science wrote, currently, the U.S. spends approximately $300 billion a year on education and less than $30 million, 0.01 percent of the overall education budget, on education research. This minuscule investment suggests a feeble long-term commitment to improving our educational system (p. 46). The vast majority of funding for research in science and mathematics education in the U.S. in recent years has come from the Education and Human Resources (EHR) Directorate of the National Science Foundation, with the lions share of funding for basic research coming from EHRs Division of Research, Evaluation, and Communication (REC). The March 25, 2005 issue of Science Magazine contains the following information on a new $120 Million funding initiative focusing on the use of randomized controlled trials to test the effectiveness of mathematics curricula: The initiative comes at the same time the Administration has requested a $107 million cut in NSFs $840 million Education and Human Resources (EHR) directorate. The cuts include a 43% decrease for the foundations division that assesses the impact of education reform efforts (Science, 11 February, p. 832). [Assistant secretary for vocational and adult education at the Department of Education Susan] Sclafani says this reallocation of education dollars reflects the Administrations eagerness for clear answers on how to improve math and science learning across the country. Thats OK with NSF Director Arden Bement, who says ED is in a better position than NSF to implement reforms nationwide. (Bhattacharjee, 2005, p. 1863) The Division of EHR sustaining the 43% budget cut identified by Bhattacharjee is the Division of Research, Evaluation, and Communication. Given that the REC has ongoing funding obligations, the proposed cuts essentially bring to a halt the funding for new research projects within the Division. Of course, it remains to be seen what the value of the new project at the Department of Education will be. But, given the track record of the What Works Clearinghouse to date (see the discussion above), there is some reason for concern. Impact on practice As discussed in the section on curriculum, the educational R&D community lacks robust mechanisms for taking ideas from the laboratory into engineering design and then large-scale implementation. This is partly for fiscal reasons. (The design refinement process outlined in this chapter is costly. As long as publishers can sell books based on the results of focus groups and avoid the expenses of that design refinement process, they will.) It is also partly a result of academic value systems. In promotion and tenure committees, theory and new academic papers tend to be valued over applications; new ideas tend to be valued over replications, extensions, and refinements; single authored work is valued more than work in teams (shares of credit are notoriously difficult to assign). Those who would systematize the R&D process thus face an incentive system that devalues teamwork, applications, and iterative design. Here too, some changes would help the field to have greater impact. It should be noted that a focus on the engineering model described here does not represent an endorsement of the linear model of research-into-practice. A substantial proportion of the work done under this aegis can and should be done in Pasteurs Quadrant (Stokes, 1997), contributing both to theory and to the solution of practical problems. Both design experiments (the initial phases of design) and contextual studies (explorations of the ways in which instructional interventions work) can and should contribute as much to theory development as they do to the creation of improved instructional materials and practices. Some final words These are, in Dickens words, the best of times and the worst of times; an age of wisdom and an age of foolishness. This chapter documents substantial progress in research on mathematical teaching and learning over the decade since the publication of the first Handbook of Educational Psychology. There have been significant theoretical advances in many areas, and practical advances as well (although the data in substantiation of those advances are less robust than one would like). There is, in sum, good reason for optimism on the intellectual front. At the same time, the larger climate is remarkably hostile to the scholarly enterprise, and there appears to be little prospect of improvement in the short run. A short-term view of the situation would be pessimistic. However a sense of history suggests that support for and hostility to the research enterprise seem to come in cycles and that in the long run, intellectual progress is sustained. It will be interesting to see what progress is reflected in the next edition of this Handbook. 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Readers with specific interests in these topics will want to consult the forthcoming Second Handbook of Research on Mathematics Teaching and Learning (Lester, in preparation).  This historical story is outlined in broad-brush terms. Given Piagets seminal mid-20th century work, for example, it may seem odd to say that the cognitive view began to flourish in the 1970s. Yet, Piagets work was largely marginalized in mainstream psychology and (mathematics) education until the final quarter of the 20th century. Only then did it gain mainstream attention.  One of the ironies of psychology is that pioneering work in artificial intelligence such as Newell and Simons (1972) Human Problem Solving (re-)legitimized the study of mind by building computer programs which produce clear traces of observable and traceable behavior, meeting the scientific criteria of the behaviorists that were inspired by conjectures about cognitive processes.  Although this narrative focuses on the Standards because of their tremendous impact, it should be noted that multiple groups were working, in concert, toward the improvement of mathematics instruction in the U.S. For example, the National Research Councils Mathematical Sciences Education Board published Everybody Counts in early 1989, paving the way for the Standards later that year.  It should be noted that a small number of reform efforts had begun (also with grant funding, independent of the major publishers) prior to the NSF call for proposals. For example, the University of Chicago School Mathematics Project (UCSMP) and the Interactive Mathematics Project (IMP) pre-dated the NSF curriculum RFPs.  I was one of the authors of the 1992 California Mathematics Framework.  The meetings are sponsored by the American Mathematical Society, Mathematical Association of America, Association for Symbolic Logic, Association for Women in Mathematics, National Association of Mathematicians, and Society for Industrial and Applied Mathematics.  There have been, of course, many studies of the impact of traditional curricula. The issue here is whether there have been evaluations along dimensions now considered appropriate for assessing students mathematical competency.  That mechanism is the What Works Clearinghouse, which is discussed below.  I served as the Senior Content Advisor for the mathematics curriculum studies conducted by WWC from its inception through the (web) publication of its first reports on middle school mathematics. It was my responsibility to delineate important curricular issues in mathematics and, in concert with WWCs technical advisory group, to help set the technical parameters for WWC reviews of mathematics curricula.  This in no way detracts from the larger point of the NRC panel, that a wide range of studies of various types is essential and informative.  Demographic data can be obtained from . In the 2000 census, 96.9% of the population identified themselves as being of one race. 50.1% classified themselves as White, and 44.4% classified themselves as Asian, including: 8.7% Asian Indian, 23.8% Chinese, 0.7% Filipino, 4.6% Japanese, 4.2% Korean, 1.0% Vietnamese and 1.4% other Asian. 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