
Accountability, Rigor, and Detracking: Achievement Effects of Embracing a Challenging Curriculum As a Universal Good for All Studentsby Carol Corbet Burris, Ed Wiley, Kevin G. Welner & John Murphy  2008 Background: This longitudinal study examines the longterm effects on the achievement of students at a diverse suburban high school after all students were given accelerated mathematics in a detracked middle school as well as ninthgrade ‘hightrack’ curriculum in all subjects in heterogeneously grouped classes. Despite considerable research indicating the ineffectiveness and inequities of ability grouping, the practice is still found in most American high schools. Research indicates that hightrack classes bring students an academic benefit while lowtrack classes are associated with lower subsequent achievement. Corresponding research demonstrates that tracks stratify students by race and class, with African American, Latino and students from lowsocioeconomic households being dramatically overrepresented in lowtrack classes and underrepresented in hightrack classes. Purpose: In light of increasing pressure to hold all students to high learning standards, educators and researchers are examining policy decisions, such as tracking, in order to determine their relationship to student achievement. Design: This study used a quasiexperimental cohort design to compare pre and postreform success in the earning of the New York State Regents diploma and the diploma of the International Baccalaureate. Data Analysis: Using binary logistic regression analysis, the authors found that there was a statistically significant postreform increase in the probability of students earning these standardsbased diplomas. Being a member of a detracked cohort was associated with an increase of roughly 70% in the odds of IB diploma attainment and a much greater increase in the odds of Regents diploma attainment – ranging from a threefold increase for White or Asian students, to a fivefold increase for African American or Latino students who were eligible to receive free or reducedprice lunch, to a 26fold increase for African American or Latino students not eligible for free or reducedprice lunch. Further, even as the enrollment in International Baccalaureate classes increased, average scores remained high.
Conclusion: The authors conclude that if a detracking reform includes high expectations for all students, sufficient resources and a commitment to the belief that students can achieve when they have access to enriched curriculum, it can be an effective strategy to help students reach high learning standards.
INTRODUCTION High schools are in dramatic need of reform, concluded the 2005 National Education Summit on High Schools (Conklin & Curran, 2005). The Summit participants, who were governors from across the nation, resolved that improvements must include higher academic standards and more challenging curricula—conclusions echoing those of Standards for Success, an extensive, multiyear study of the Association of American Universities (AAU) and the Pew Charitable Trusts (Conley, 2005). Standards for Success called for dramatic high school curricular upgrades in both skills and content to adequately prepare American students for university studies. Both studies reflect the overwhelming belief among educators, policy makers, and the public that all students should be engaged in highly challenging academic programs. Students themselves have similarly acknowledged the need for more academic rigor. A highprofile survey of nearly 1,500 public high school graduates found that 76% were neither challenged academically nor adequately prepared by their high school for college or the workplace (Peter D. Hart Research Associates, 2005). Furthermore, those surveyed said that they would have worked harder if their school had demanded more of them. These calls for more rigorous standards arrive in the wake of a prolonged wave of standardsbased accountability reforms, culminating in the No Child Left Behind Act of 2001 (NCLB). Advocates of such policies believe that school accountability legislation acts as a catalyst for changes in instruction, expectations and curriculum and will thus result in increased academic performance (Berger, 2000; see also Heubert & Hauser, 1999; Natriello & Pallas, 1999). Although specific policies such as NCLB are controversial, most American policymakers appear—on the surface, at least—to share the basic principles of rigor and achievement. Below this surface agreement, however, lie signs that not all educational policymakers view a rich, challenging curriculum as a universal good or an achievable goal. One clear artifact of these lesser expectations is the continued use of tracking, also known as ability grouping, which denies many students access to excellent curriculum and teaching (Oakes, 2005). In fact, one of the tragedies of the standards movement is that schools, desperate to find ways to increase test scores, are relying on practices such as tracking and retention, strategies that are not only counterproductive but also inimical to the very goals of a movement which was intended as a means of closing the achievement gap (Sandholtz, Ogawa, & Schribner, 2004; Thompson, 2001). Ironically, the most successful response to the pressures of standardsbased accountability policies may be the opposite approach: detracking. The longitudinal, quasiexperimental study reported in this article examines the process and outcomes of a diverse suburban district’s detracking reform within the context of the standards movement. As this district struggled to help all students achieve high learning standards, it recognized that the standardsbased accountability movement shares a core belief with the detracking movement: a challenging curriculum is a universal good and is a benefit to all students (Welner, 2001b). Detracking, when it is done with vigilance and care, can promote both excellence and equity, thus fulfilling the original intent of the accountability movement to depart “radically from the tracking and sorting carried out by the factorystyle school of yore” (Thompson, 2001, p. 358). BACKGROUND TRACKING AND HIGH LEARNING STANDARDS In light of increasing pressure to hold all students to high learning standards, policy decisions such as tracking have taken on increased importance (Welner, 2001b). The influence of tracking on student achievement was recently noted when the nation’s governors met at the abovementioned 2005 National Education Summit on High Schools. Their concluding report entitled, “An Action Agenda for Improving America’s High Schools,” states the following: American high schools typically track some students into a rigorous collegepreparatory program, others into vocational programs with lessrigorous curriculum and still others into a general track. Today, all students need to learn the rigorous content usually reserved for collegebound students, particularly in math and English. (Conklin & Curran, 2005, p.11) The governors recognized that, as the job market becomes increasingly competitive, the sorting and selecting practices of the past, whereby educators steered students into less rigorous tracks based on perceived ability and career paths, no longer serve the needs of the nation’s youth. However, although the governors acknowledged the role that tracking plays in providing lessrigorous educational pathways, they fell short of calling for its abolishment. Instead, their report refers to appealing to differing student interests and asserts the need to include a rigorous curricula in all classrooms, implicitly concluding that it is possible to embrace rigor and lowtrack ‘solutions’ at the same time. Research on tracking, however, suggests that such lowtrack solutions are destined to disappoint. RESEARCH ON TRACKING Since the turn of the 20th century, schools have placed students in different classes based on perceived ability (Goff, 1995; Kliebard, 1995; Oakes, 2005). In the 1980s, with the 1985 publication of Jeannie Oakes’s Keeping Track: How Schools Structure Inequality, researchers began to seriously question whether this practice was fair or effective. During the 1980s and 1990s, Oakes and other researchers repeatedly demonstrated that tracking depresses student achievement and causes racial and socioeconomic stratification in schools (Braddock & Dawkins, 1993; Gamoran, 1986, 1992; Lipman, 1998). The asserted purpose of tracking is to tailor the rigor and pacing of curriculum to meet the specific learning needs of all students. Therefore, the accuracy of track placement should be a matter of critical importance to schools. Numerous studies, however, have demonstrated that the process of assigning students to tracks is influenced by factors unrelated to student achievement (Garet & DeLany, 1988; George, 1992; Goyochea, 2000; Lucas, 1999, 1999; Oakes, 2005; Useem, 1992; Wells & Oakes, 1996; Wells & Serna, 1996; Welner, 2001a). For example, the philosophy of school leaders and organizational factors of the school, such as the perceived number of vacancies in classes, often influence the decision as to whether or not a student is placed in advanced classes (Garet & Delany; Hallinan & Sorenson, 1987; Useem, 1992). In addition, parents with college degrees are more likely to intervene in school experiences, resulting in their child’s placement in advanced mathematics classes that lead to the study of calculus in high school (Useem, 1992; see also Wells & Serna, 1996). There is also ample evidence to show that tracks stratify students by race and class. African American and Latino students are dramatically overrepresented in lowtrack classes and underrepresented in hightrack classes (Black, 1992; Braddock & Dawkins, 1993; Hallinan, 1992; Oakes, Ormset, Bell, & Camp, 1990; Slavin & Braddock, 1993). Socioeconomic status (SES) has been found to affect track location as well (Lucas, 1999; Lucas & Gamoran, 1993; Vanfossen, Jones, & Spade, 1987). Even after accounting for prior performance, high SES students are overrepresented in the academic track, and the effect of SES on track placement extends beyond the effect of SES on student performance (Vanfossen et al.). The theory that instruction in tracked classes is tailored to meet students’ academic needs is difficult to support in light of the preponderance of studies that identify the many nonacademic factors that influence track placement. TRACKING AND STUDENT ACHIEVEMENT Considering the racial and socioeconomic stratification caused by tracking, the practice would seem defensible only if it has a positive effect on student learning. Yet the preponderance of studies indicates that lowtrack classes are associated with depressed student achievement (Heubert & Hauser, 1999; Oakes et al., 1990). In addition, these studies indicate that the achievement gap between low and highachieving students widens over time in tracked settings (Gamoran & Mare, 1989). This is because lowtrack classes, “typically characterized by an exclusive focus on basic skills, low expectations, and the least qualified teachers,” cause students to fall further and further behind (Heubert & Hauser, p. 282). In contrast, research on accelerated instruction indicates that an enriched curriculum enhances the performance of low achievers and students at risk of failure (Bloom, Ham, Melton, & O’Brient, 2001; Levin, 1997; Mehan, Villanueva, Hubbard, & Lintz, 1996; Peterson, 1989; Singham, 2003). It is not surprising then, that studies have found higher student achievement in hightrack classes than in lowtrack classes (Epple, Newlon, & Romano, 2002; Heubert & Hauser, 1999; Oakes, Gamoran, & Page, 1992; Welner, 2001a). What is less clear is the effect on high achievers when they study in detracked classrooms. Some studies report that the learning of higher achievers decreases in detracked, heterogeneous classes (Brewer, Rees, & Argys, 1995; Epstein & MacIver, 1992; Kulik, 1992), while other studies report no significant differences (Burris, Heubert, & Levin, 2006; Figlio & Page, 2002; Mosteller, Light, & Sachs, 1996; Slavin, 1990). In a study of two high schools in England, Boaler (2002) found that traditional, hightrack mathematics classes were associated with a disadvantage to highachieving students—in achievement as well as in enjoyment of mathematics—when compared to a heterogeneous class using reformed curriculum, pedagogy, and assessment. Even in studies that find that hightrack classes result in higher achievement, it is not clear why this is so. Researchers have not been able to disentangle the effects of specific factors associated with hightrack classes, such as peer effects, better instruction, and more qualified teachers (Kerckhoff, 1986; Oakes 1986; Slavin & Braddock, 1993). Reflecting on the results of his own study, Kerckhoff states: “While the evidence presented here does strongly support the divergence hypothesis that tracking differentially effects [sic] performances of high and low ability groups, it does not provide an explanation of that effect” (p. 856). He continues on to suggest that a hightrack advantage may be the result of differentiated curriculum, better teachers in hightrack classes, or classroom culture. Similarly, Oakes (1982, 1986, 2005) found that students in hightrack classes receive higherquality instruction, and that lessons in hightrack classes include higherlevel thinking skills rather than drillandpractice activities. She and other scholars believe that any higher achievement associated with hightrack classes results not from grouping practices per se, but from the factors described above (Levin, 1997; Wheelock, 1992). If highly proficient students show lower achievement in heterogeneous classes, it is possible that it is not due to the presence of low and averageachieving students in the class, but rather to the dilution of highlevel instruction as teachers attempt to teach to the perceived middle. Scholars who support detracking view an accelerated curriculum as a universal good—of benefit to all students. Rather than viewing curriculum adjustment as a rationale for tracking, these researchers view it as a means by which to successfully detrack schools. Oakes (1990), Slavin and Braddock (1993), Braddock and Dawkins (1993), and Wheelock (1992), for example, propose that detracking occur as a process of “leveling up.” These researchers argue that detracking will only work if “the top track” curriculum “becomes accessible to a broader range of students without watering it down” (Slavin & Braddock, p. 15). In addition, other researchers, such as Henry Levin (1997), founder of the Accelerated Schools Movement, contend that accelerating learning, rather than remediation, is the best method of improving the achievement of struggling, atrisk students. Administrative progressives and Taylorist educators in the first part of the 20^{th} century held a contrasting view, approaching accelerated instruction with a dual, stratified mindset (Ravitch, 2000). The same curriculum was viewed as a benefit for “smart” students but as a detriment for “slower” students who, according to these proponents of tracking, were likely to feel frustrated. More recently, researchers who favor tracking have argued that if students were equitably and accurately assigned to tracks, and if the quality of both curriculum and instruction were improved, then the negative effects of tracking on lowachieving students would likely be eliminated (Hallinan, 1994; Loveless, 1998; see also Gamoran & Weinstein, 1998). The most common justification for tracking today rests on the belief that high achievers will be hurt by heterogeneous grouping. According to Kulik (1992), providing tracked classrooms for high achievers is part of the American public school tradition of offering “special classes for students with special needs” (p. xiii). Those who favor tracking warn that if there is an influx of lowachieving students in hightrack classes, the learning of high achievers might be adversely affected even if the hightrack curriculum remains (Gamoran & Hannigan, 2000; White, Gamoran, Porter, & Smithson, 1996). This difference of opinion outlined above frames the question that is at the heart of the modern tracking debate, and there is now a most compelling reason for this debate to be resolved. With policymakers demanding that all students attain higher learning standards and that achievement gaps close, researchers can assist by determining whether any hightrack advantage is due to a more rigorous curriculum, better resources, peer effects, or other yet unidentified factors. THE PURPOSE OF THIS STUDY Our study responds to this question by examining patterns of student achievement when a district gradually detracked its middle and high school, offering all students a rich, accelerated curriculum in heterogeneously grouped classes. If these students prove unsuccessful, a reasonable conclusion might be that attributes of a homogeneous environment account for the positive hightrack outcomes seen in some studies. If, on the other hand, students benefit from the enriched curriculum, a reasonable conclusion might be that any potential hightrack advantage is primarily due to the curriculum and expectations of hightrack classes. If this is so, then detracking with a hightrack curriculum would serve two beneficial outcomes: (a) ameliorate the racial and socioeconomic stratification associated with tracking, and (b) increase student achievement without denying high achievers access to high expectations and rigorous curricula. In this study we examine the effects of heterogeneous grouping combined with hightrack curricula on two achievement measures of importance. We describe the results of a longitudinal study of the effects on student achievement when lowtrack classes were gradually eliminated and replaced with heterogeneously grouped classes in a demographically diverse, suburban high school. Specifically, we examine how detracking affected the earning of two diplomas that represent high standards of achievement—the New York State Regents diploma and the diploma of the International Baccalaureate (IB). The first diploma is tied to New York State standards; the IB Diploma is tied to worldclass standards. In addition, we provide a rich description of the context in which this reform occurred. Our intent is that this study will further inform the debate on detracking with enriched curricula as an instructional strategy and that it will add to the emerging literature on accelerated study as an alternative to remediation. CONTEXT This detracking reform took place in a demographically diverse school in a New York State suburban school district. The district’s history and demographics, as well as its leaders’ philosophy, influenced the reform’s origins and implementation. This section describes the district, the rationale for detracking, and the multiyear implementation process. THE DISTRICT OF STUDY The school district is located in a suburban community of 28,000 in Nassau County on Long Island. It operates five elementary schools serving grades K–5, a middle school serving grades 6–8, and a high school serving grades 9–12.^{1} New York categorizes the district as one of low needs relative to resource capacity. However, the high school is nevertheless categorized as having a greater number of students of poverty than the usual lowneeds district. The district student/teacher ratio of 12:1 approximates the county average of 13:1, and spending per student is approximately the same as the mean for the county (slightly more than $15,000 per pupil, reflecting the New York City suburb’s high cost of living). All of the district’s teachers are certified in their area of teaching, which is typical of Long Island districts and now mandated by New York State. Approximately 20% of the high school’s nearly 1,200 students are African American or Latino, about 12% of all students qualify for free or reducedprice lunch, and approximately 10% are specialeducation students. Of those students who receive free or reducedprice lunch, virtually all are minority students—56% of all African American or Latino students participate in the subsidized lunch program. ELIMINATING THE THIRD TRACK In 1993, the district’s superintendent and the Board of Education established an ambitious goal: By the year 2000, 75% of all graduates would earn a New York State Regents diploma, in addition to a local diploma. To earn a Regents diploma, students must pass a minimum of eight rigorous state Regents exams in multiple subject areas in addition to fulfilling all course requirements. This goal reflected the superintendent’s strong belief in the assessment of student learning by an objective, external standard, and it also reflected the district’s commitment to academic rigor. At that time, the respective Regents diploma rates for the district and the state were 58% and 38%. The district gradually eliminated lowtrack courses that did not follow Regents curriculum, and eased the transition by offering struggling students instructional support classes while carefully monitoring these students’ progress. At the same time, the “gates” to study honors courses were opened, and any student who wanted to take a hightrack class could do so. Over a period of about four years, the high school replaced a threelevel rigid tracking system with one that had two tracks in grades 9–12. The honors classes in the 11^{th} and 12^{th} grades were International Baccalaureate and/or Advanced Placement courses in all subjects. Although the overall number of Regents diplomas increased after the lowest, thirdtier tracks were eliminated during the early 1990s, a disturbing profile emerged of students who were not earning the diploma. These students not reaching this standard were more likely to be African American or Latino, receive free or reducedprice lunch, or have a learning disability. While majority, middleclass, regulareducation students made great progress in earning the Regents diploma after the school eliminated the lower track, students of color and poverty, as well as students with learning disabilities, were left behind. If all graduates were to earn the Regents diploma, systemic change would need to occur to close the gaps and ensure that the school met the needs of all students. ACCELERATED MATHEMATICS IN HETEROGENEOUS CLASSES School leaders noticed that passing the second mathematics Regents exam appeared to be the most common roadblock for students in earning a Regents diploma. While hightrack students met the mathematics requirement by the end of ninth grade and enrolled in the third Regents mathematics course in the tenth grade, lowtrack students did not even begin the first Regents mathematics course until grade ten. In order to provide all students with ample opportunity to pass the needed courses, in 1995 the district decided that all middleschool students would study the accelerated mathematics curriculum formerly reserved for the district’s highest achievers. Under the leadership of the assistant principal of the middle school, the school’s mathematics teachers revised and condensed the curriculum. The new curriculum was taught to all students, in heterogeneously grouped classes. To assist struggling learners, the school initiated support classes called ‘mathematics workshops’ and provided afterschool help four afternoons a week. The results were positive. More than 90% of incoming freshmen entered the high school having passed the first Regents mathematics examination. The achievement gap dramatically narrowed. Between the years of 1995 and 1997, only 23% of regulareducation African American or Latino students passed this algebrabased Regents exam before entering high school. After universally accelerating all students in heterogeneously grouped classes, the percentage more than tripled—up to 75%. The percentage of White or Asian American regulareducation students who passed also greatly increased—from 54% to 98%. HETEROGENEOUS GROUPING IN THE HIGH SCHOOL When universal mathematics acceleration began, the district cautiously excluded some specialeducation students from the first Regents mathematics exam until they completed ninth grade. These students with learning disabilities were placed in a doubleperiod, lowtrack Sequential I ninthgrade mathematics class, along with lowachieving new entrants. Consistent with the recommendations of researchers who have defended tracking and encouraged its reform (e.g., Hallinan, 1994; Loveless, 1999b), this class was rich in instructional resources—a mathematics teacher, a specialeducation inclusion teacher, and a teaching assistant. Class size was limited to 15 or fewer students. Yet the lowtrack culture of the class was an obstacle to learning as teachers spent valuable instructional time addressing behaviormanagement issues. District and school leaders decided that this lowtrack class failed its purpose, and the high school principal became convinced that tracking was an ineffective strategy, especially for low achievers. The class was eliminated and the district boldly moved forward with several new reforms the following year. All specialeducation students, with the exception of students who were developmentally delayed, in the ninthgrade year of entry (YOE) cohort of 1999 took the mathematics Regents exam in the eighth grade, with all other regulareducation students.^{2} The YOE cohort of 1999 also studied science in heterogeneous classes throughout middle school, and it became the first cohort to be heterogeneously grouped in ninthgrade English and social studies classes. Ninthgrade teachers were pleased with the results. They described their classes as academic, focused, and enriched. Science teachers reported that the heterogeneously grouped middle school science program prepared students well for ninthgrade biology. Detracking at the highschool level continued, paralleling the introduction of revised New York State standardsbased curricula. Students in the YOE 2000 cohort studied the state’s new biology curriculum, titled “The Living Environment,” in heterogeneously grouped classes. The following September, the state’s new Mathematics A curriculum was taught to the cohort of 2001 without tracking; this class was accordingly the first class to be heterogeneously grouped in all subjects in the ninth grade. Table 1. Progression of Detracking Courses: Grades 610 Reaching Higher: The International Baccalaureate The International Baccalaureate Diploma Program (IB) was created in 1967 in order to serve the educational needs of students who were geographically mobile, such as the children of military personnel, diplomats, and international executives. These students needed highquality academic instruction in order to meet the university entrance requirements in their native countries (Duevel, 1999). In 1983, the Rockville Centre School District introduced the IB program as a highly exclusive program to serve “gifted and talented” students in the high school. Initially, enrollment levels were low. For example, the class whose year of entry (YOE) into high school was 1984, and who graduated in 1988, had only 9 diploma candidates. However, in early 1990s the district began to eliminate the lower track and instituted open enrollment in honors classes. Any student could, in theory, take IB courses in their junior and senior years. Effectively, students made this decision very early in their schooling, when they chose whether they would study honorstrack English, social studies, mathematics, and science courses in the ninth and tenth grade. The “late bloomer” students, who decided to opt for the IB program in their junior year, were thus at a disadvantage. As the school progressively detracked the ninth and tenth grades, enrollment in eleventh and twelfthgrade IB courses grew, allowing a majority of students to participate in the program. The structure and philosophy underlying the IB Diploma program was an ideal fit for the detracking initiatives that were underway in the district. Both the school district and the IB program believe that “student capability…is not a static, invariant quality, such as a student’s height would be, but is something more dynamic and variable in nature” (International Baccalaureate Organization, 2005). In other words, given the opportunity to study enriched, challenging curriculum that develops higherorder thinking skills, student capacity to learn and think can grow and expand. Between 1990 and 2005, the total number of IB examinations taken by students in the high school of study increased more than tenfold, from 75 to 993. As indicated in Table 2, even as the program expanded, student scores on IB examinations have remained high. In fact, during the last five years (2001–2005), the percentage of students earning the highest scores (4 and above) exceeds the percentage of students earning high scores in early years (1990–1994) when far fewer students took IB courses. While this table provides descriptive data only, it suggests that the learning of the school’s highest achievers was not adversely impacted by an influx of lower achievers into rigorous IB classes. Both in number and proportion, the highest scores of 6 or 7 on these secure and standardized international examinations increased as the program became more inclusive. Table 2. Growth in the IB Program 19902005: Number of Exams Taken and Grade Distribution Note: IB scores range from 7 (highest) to 1(lowest) Over the past dozen years, the district’s detracking has progressively expanded. Beginning in the 200506 school year, heterogeneous grouping extended into tenthgrade mathematics, and all students now take the second year of Mathematics B (a course in advanced algebra, trigonometry and precalculus) in heterogeneously grouped classes. RESEARCH DESIGN AND METHODOLOGY COHORTS OF INTEREST To determine the effects of detracking the district’s middle school and high school, we examined demographic and achievement data for six cohorts of students. The first three cohorts entered high school in 1995, 1996, and 1997, the three years prior to universal acceleration in mathematics and also prior to the beginnings of detracking the ninth grade. The final three cohorts were among the first four cohorts in which all students were accelerated and heterogeneously grouped in middleschool mathematics and experienced at least some detracking in grade 9 (see Table 1). Specifically, these cohorts entered high school in 1998, 1999, and 2001. Unfortunately, data from the yearofentry (YOE) 2000 cohort could not be included. This cohort took the 10th grade PSAT in October 2001; their examinations were among those lost due to anthrax exposure in a New Jersey post office in the fall of 2001. During the years of this study, the racial demographics and socioeconomic cohort population characteristics remained stable. The percentage of high school students qualifying for free or reducedprice lunch varied between 11% and 14%. In any given cohort, racial/ethnic makeup also stayed within a small band: for African American students, between 7% and 8%; for Latino students, between 10% and 12%; for White students, between 77% and 78%; and for Asian American students, between 3% and 5%. Moreover, the real estate market within the district remained stable—there were no major construction projects and district boundaries did not change. Selection effects are possible, however, even in stable populations. For example, the inclusion of transfer students who entered the high school after ninth grade could bias study results. One strategy for eliminating such effects is to include only data for cohort members who have the most similar histories – students who obtained their complete high school education through this school’s regular program (Cook & Campbell, 1979). Therefore, student data were included only for regular and specialeducation cohort members who: (a) were continuously enrolled in the school district from the ninth grade to the exit of high school, (b) had a YOE into ninth grade from 1995–2001 (excepting 2000), and (c) were not developmentally delayed.^{3} Applying these criteria, each of the six cohorts ranged in number between 221 and 262 students. There were a total of 1,300 individual student records included in this study. The study used four measures of student achievement, two of which are based on the Practice Scholastic Assessment Test (PSAT), which students take in the tenth grade, as discussed in the next section of this article. The four measures are as follows: (a) scores on the verbal portion of the PSAT, (b) scores on the mathematics portion of the PSAT, (c) the earning of the New York State Regents diploma, and (d) the earning of the International Baccalaureate diploma. PSAT scores were used to create an independent variable representing student scholastic aptitude (described below); the two indicators of diploma attainment were used as outcome measures of achievement. THE PRACTICE SCHOLASTIC ASSESSMENT TEST (PSAT) The PSAT is a standardized test typically given to high school students to provide practice for the Scholastic Assessment Test (SAT) and to qualify them for National Merit Scholarships. The PSAT measures critical reading skills, mathematics problemsolving skills, and writing skills. Like the SAT, it produces normalized verbal and mathematics scores. The SAT, used primarily for college admission purposes, is a test that is indicative of academic aptitude commonly referred to as g (Frey & Detterman, 2004). The school district pays for all of its students to take the PSAT in the 10^{th} grade; therefore, nearly all students have the exam in their records. In this analysis we use PSAT mathematics and PSAT verbal exam scores to provide a measure of general scholastic aptitude; this will allow us to address the important question of whether the effect of detracking is constant across prior achievement levels. In this sample, overall PSAT mathematics and verbal scores are highly related; the Pearson correlation between the two measures is r=0.730 (p<.001). This strong relationship clearly points to the influence of a general level of aptitude in addition to aptitude specific to each measure’s subject area. PSAT scores could be used in several ways to represent general scholastic aptitude in our statistical analysis; three such strategies are discussed here. First, both the verbal and mathematics measures could be included in a statistical model. However, this strategy is not advisable, since the two predictors are very highly correlated, which would preclude us from interpreting the two individual estimates. A second strategy is to include only one of the two scores in our statistical model. This, too, is not ideal, since any given measure would not only reflect general scholastic aptitude but also scholastic aptitude specific to the designated subject area (and measurement error). A third strategy—the one ultimately employed in this analysis—is to estimate a general aptitude score from the correlated part of the two individual subject measures. This approach is premised on the assumption that an individual’s PSAT mathematics and verbal scores share the influence of that individual’s general scholastic aptitude. That is, a given student’s mathematics and verbal scores should each be influenced by the same general scholastic aptitude. To estimate this general aptitude we used principal components analysis (PCA) to create an index of component scores from the first principal component taken from the two measures. PCA is a statistical method for transforming correlated variables into new variables that are uncorrelated with each other and best represent the variance shared by original variables (Dillon & Goldstein, 1984). In our PCA analysis of PSAT verbal and mathematics scores, the first principal component represents the correlated part of these two scores—the influence shared by the two assessments rather than specific to one of the designated subject areas. Component scores for the first principal component—values calculated for each individual based only on the correlated part of the two assessments—were used as a measure of aptitude common across the two assessments (Dillon & Goldstein). This index, measured in standard normal units (mean = 0; standard deviation = 1), is hereafter represented by the independent variable “APTITUDE” and is used to model whether the effects of detracking varied for students at different levels of scholastic aptitude. NEW YORK STATE REGENTS DIPLOMA During all but the final year analyzed in this study,^{4} in order to qualify for a New York State Regents diploma, students needed to pass a minimum of eight endofcourse Regents examinations including the following: (a) two in mathematics, (b) two in laboratory sciences, (c) two in social studies, (d) one in English Language Arts, and (e) one in a foreign language.^{5} All coursework in the above subject areas must be passed as well. The secure Regents examinations are prepared by a committee of New York State teachers in conjunction with education department specialists in the subject matter and in testing (New York State Department of Education, 2001). Examinations are given three times a year, in January, June and August, at a time designated by the New York State Board of Regents. Scores range from 0%–100%. Scores of 65% and above are designated as passing by the New York State Board of Regents, and scores of 85% and above are designated as reflecting mastery. If students pass all of the needed exams, all required coursework, and earn at least the designated number of highschool credits, a Regents diploma is awarded upon graduation. Students who do not meet these standards may receive a local (also called “school”) diploma by meeting local and state diploma requirements. THE INTERNATIONAL BACCALAUREATE DIPLOMA The IB Diploma Program, which is offered in the final two years of secondary school, is a rigorous course of study that encompasses six areas of curriculum: (1) language A1 (the student’s first language), (2) second languages, (3) individuals and society, (4) experimental sciences, (5) mathematics and computer science, and (6) the arts. Student learning is measured by criterionreferenced assessments, which are consistent from year to year and applied equally across schools (International Baccalaureate Organization, 2005). International senior examiners grade the student work.^{6} Participating schools must be accredited by the International Baccalaureate Organization (IBO), and must make a substantial commitment to teacher training and development.^{7} Colleges around the globe give students credit for IB courses, recognizing the demanding nature of the curriculum and the assessments. Students may elect to become full IB diploma candidates, or they may study individual courses to earn certificates. In order to receive the IB Diploma, students must earn a minimum of twentyfour points on assessments from six IB courses, five of which must come from the five areas of study, referred to as groups 1–5. Three of the courses must be taken at the higher level; in other words, the course must meet for no less than 240 classroom hours. The remaining three courses must meet for a minimum of 150 hours. Students also must successfully complete three central elements: (a) Community Action Service, which is a reflective chronicle of their extracurricular/service learning activities; (b) Theory of Knowledge, a transdisciplinary epistemology course; and (c) the Extended Essay, an extensive independent research project of no more than 4000 words, conducted over the course of two years under the guidance of a faculty mentor. STUDENT DEMOGRAPHICS Given the complex interaction between program and social factors in any social science context, analysis in educational research should include consideration of the demographic characteristics of research subjects. Two such variables often included in such analyses are ethnicity and socioeconomic status. Ideally data would support analyses that disentangled the effects associated with each of these variables; such data would support estimation of separate main effects for each variable as well as the interaction between the two. In practice, however, these two variables are often strongly related. For example, African American and Latino students in the United States tend to be more likely to come from families lower in socioeconomic status than do White students (Cabrera & Bernal, 1998). As such it is often impossible to estimate effects as though the two were orthogonal. In this sample, 107 of the 124 students eligible for free or reducedprice lunch (86.3%) are either African American or Latino, whereas only 76 of the 1,176 students not eligible for lunch programs (6.5%) are also African American or Latino (Table 3). Main effects for SES and ethnicity, therefore, cannot be interpreted from this sample, since these two variables are overwhelmingly related. Table 3. SES and Minority Status Crosstabulation To address this issue in our analyses we describe students as represented by one of four independent groups based on the combination of ethnicity and socioeconomic status. Group indicator variables are used in order to estimate main effects of group membership (i.e., group differences in likelihood of diploma attainment) as well as interactions between other variables and group membership (i.e., group differences in the relationship between aptitude or cohort and diploma attainment). VARIABLES The variables used to answer the research questions were the following: REGDIP—A dependent binary variable of 0 or 1 to indicate whether the student received a Regents diploma. IBDIP—A dependent binary variable of 0 or 1 to indicate whether the student received an International Baccalaureate diploma. SPED—An independent binary variable of 0 or 1 that represents whether the student received special education services. APTITUDE—an independent variable measured in standard normal units that represents estimated general scholastic aptitude. GROUP1—Free or Reduced Price Lunch (“FRPL”) eligible and either Latino or African American.^{8} GROUP2—FRPL eligible and either Asian American or White. GROUP3—Ineligible for FRPL and either Latino or African American. GROUP4—Ineligible for FRPL and either Asian American or White.^{9} PREPOST—An independent binary variable of 0 or 1 to indicate whether the student was a member of a cohort (1) that entered high school in September 1998 or beyond. Descriptive statistics for the variables used in this study are presented in Table 4. Table 4. Descriptive Statistics ANALYTIC STRATEGY Attainment of the two diploma types (REGDIP and IBDIP) was modeled using logistic regression on independent variables representing tracked status (PREPOST), scholastic aptitude (APTITUDE), demographic characteristic grouping (GROUP1, GROUP2, and GROUP3), and special education identification (SPED). Several models were fit for each dependent variable, using a threestage framework by which we took the following steps: (a) we started with aptituderelated, demographic, and special education variables; (b) we then progressively added main effects as well as interactions with the trackedstatus variable; and (c) finally, we progressively removed those variables which do not appear to add explanatory power to the model. For each of our models, we report statistics for individual predictors (e.g., coefficient estimates, significance values, and odds ratios) as well as for the model as a whole (e.g., log likelihoods and pseudoR^{2}). We describe results at each step of the process; however, our interpretation of these results is offered only at the end of each diploma discussion, after all the models for that diploma are presented. The final models best balance explanatory power and parsimony, and therefore provide the basis for the conclusions presented in the discussion sections. RESULTS REGENTS DIPLOMA ATTAINMENT Logistic regression models for the attainment of the Regents diploma are provided in Table 5ab. Table 5a. Regents Diploma Models (1 of 2) Table 5b. Regents Diploma Models (2 of 2) The first four models increase in complexity through the progressive addition of independent variables. Model 1 begins with only the main effects for aptitude, special education, and demographic group indicator variables. As expected, APTITUDE is positively associated with Regents diploma attainment, while attainment is less likely for GROUP1, GROUP2, and SPED. Model 2 adds all possible 2way interactions between these variables. Taken together, these interactions add significant explanatory power to the model (X^{2}(7) = 26.09, p<.001).^{10} Model 3 is the first model to include the programmatic variable (PREPOST), representing the effect of detracking. Adding PREPOST to the model adds significant explanatory power (X^{2}(1) = 35.6, p<.001); the likelihood that the effect of detracking showed up due to randomness is less than one chance in one thousand. According to Model 3, students in detracked cohorts have odds of Regents diploma attainment nearly six times greater than their tracked counterparts with corresponding aptitude and demographic characteristics. Model 4 includes all possible main effects and 2way interactions. The main effect for PREPOST is again positive, and large odds ratios for the PREPOST interactions with GROUP1 and GROUP3 provide some indication of differential effects of detracking for these groups, though they are not statistically significant when the full set of predictors is included in this model. Models 5–7 represent a paring down of predictors to achieve parsimony in addition to explanatory power. The main effects and interactions with GROUP2 are removed for Model 5. Only 17 individuals are either Asian American or White yet are FRPL eligible; this small sample size cannot support separate estimates for this group, as evidenced by the lack of statistical significance and extreme odds ratio estimates. The same problem is addressed in Model 6 for SPED, although the main effect is left in because it is strongly significant (reflecting the fact that fewer special education students received Regents diplomas). A potentially important 2way interaction—the interaction between PREPOST and APTITUDE—is also removed, along with other APTITUDE interactions, in Model 7, with virtually no change in explanatory power (X^{2}(1) = 1.13, p>.05). The lack of significance of this interaction is particularly important because it suggests a counter to one of the main arguments against detracking – that detracking helps lowaptitude students at the expense of students at the upper end of the aptitude spectrum. Had this been true in the current study, the PREPOST x APTITUDE interaction would have had a significant negative effect on Regents diploma attainment. This is clearly not the case according to Model 7. Conditional on the other variables in the model, the positive effect of detracking encompasses (is not statistically different for) both low and highaptitude students in the earning of a Regents diploma. Accordingly, Model 7 represents what we believe to be the best balance between explanatory power and parsimony. The remaining terms are both statistically and practically significant. Each of the remaining coefficients has a pvalue less than 0.05; each corresponding odds ratio (exp(B)) is far from 1.0. The inference regarding detracking is clear from Model 7 (and is strikingly consistent across all models): being a member of a detracked cohort is associated with substantial increases in the odds of attaining the Regents diploma. For students in Group 2 (nonminority, FRPL eligible) and Group 4 (nonminority, nonFRPLeligible), the benefit is a 3fold increase. The impact of detracking appears to be even greater for those students in Group 1 (minority, FRPLeligible) and Group 3 (minority, nonFRPLeligible). For these students, detracking appeared to improve the odds of diploma attainment by factors of greater than 5 and greater than 26, respectively—nearly compensating for the negative main effect of GROUP1 status and more than compensating for the negative effect of GROUP3 status. In sum, detracking is associated with positive results for all students, with even greater results shown for those who, in the State of New York, are far less likely to earn a Regents diploma (Mills, 2004). The following illustration, based on coefficient odds ratios, helps to place the magnitude of the effect associated with detracking in context. The odds ratio for PREPOST (3.35) is nearly half as large (47%) as the odds ratio of APTITUDE (7.07). As such, for those students in GROUP2 and GROUP4, being a member of a detracked cohort gives an improvement of the odds of Regents diploma attainment similar in magnitude to an increase of .47 standard deviations of APTITUDE. This means that detracked students at the 25th percentile of APTITUDE would share the same Regents odds ratio as their tracked counterparts at the 42nd percentile of APTITUDE. Similarly, detracked students at the 45th percentile of APTITUDE would share the same Regents odds ratio as their tracked counterparts at the 64th percentile of APTITUDE. These analyses suggest the powerful role that detracking played in helping this school district substantially increase the proportion of its students earning the New York State Regents diploma. For members of GROUP 1, detracked students at the 25th percentile of APTITUDE would share the same Regents odds ratio as their tracked counterparts at the 80th percentile of APTITUDE. And for members of GROUP 3, detracked students at the 25th percentile of APTITUDE would share the same Regents odds ratio as their tracked counterparts at the 95th percentile of APTITUDE. Figures 1–3 demonstrate the positive effect of being a member of a detracked cohort for nonspecial education students in each of the groups in this sample, based on Model 7. For each demographic group, the likelihood of Regents diploma attainment is plotted against APTITUDE for both tracked and detracked cohorts. In each case the detracked cohort has a substantially greater likelihood of receiving the Regents diploma at virtually every level of APTITUDE. Figure 1. Figure 2. Figure 3. INTERNATIONAL BACCALAUREATE DIPLOMA ATTAINMENT Logistic regression models for the attainment of the International Baccalaureate Diploma (IBDIP) are provided in Table 6ab. Table 6a. IB Diploma Models (1 of 2) Table 6b. IB Diploma Models The first four models increase in complexity in exactly the same manner as those for REGDIP, as presented in the last section. Model 1 again begins with only the main effects for aptituderelated and demographic variables. APTITUDE provides most of the predictive power in Model 1. Although it is not statistically significant, SPED is also associated with a strong negative effect – according to this model, the odds of IB diploma attainment by special education students were nearly zero. Model 2 introduces interactions between the variables in Model 1; these appear to add little to the model (X^{2}(7) = 4.3, p>.05). Adding PREPOST to Model 3 significantly increases explanatory power (X^{2}(1) = 12.71, p<.001) and presents an odds ratio of 1.75, suggesting that students in detracked cohorts have 75% greater odds of attaining an IB diploma than their tracked counterparts. Similar to the case for Regents diploma attainment above, interactions of PREPOST with aptituderelated and demographic variables add little explanatory power in Model 4. Models 59 exclude predictors in the name of parsimony. The removal of GROUP2 main effects results in no significant loss of explanatory power, nor does the removal of GROUP2 its interactions (Model 5). Removing all interactions with SPED (Model 6), while keeping the main effect in the model, also results in no significant loss of explanatory power. Model 7 removes the interaction between PREPOST and APTITUDE. Consistent with Model 6 of the Regents diploma analysis above, Model 7 demonstrates that little explanatory power is gained from this interaction—effects of detracking on IB diploma attainment appear to be uniform and positive across aptitude levels. Models 8 and 9 continue the progression toward parsimony by removing main effects and interactions for GROUP3 and GROUP1, respectively. Although the magnitude of GROUP1 effects and corresponding odds ratios appear large (and similar in magnitude to those from the Regents analysis), they are not statistically significant in this model. As with Model 7 for the Regents diploma analysis, here Model 9 represents our best candidate to balance explanatory power and parsimony. Once again, the inference regarding detracking is the same: being a member of a detracked cohort is associated with an increase of roughly 70% in the odds of IB diploma attainment (based on an odds ratio (exp(B)) of 1.72). This PREPOST odds ratio is 27% as large as the odds ratio of APTITUDE (6.18), meaning that detracking is associated with an improvement of the odds of IB diploma attainment similar in magnitude to an increase of .27 standard deviations of APTITUDE. Detracked students at the 25th percentile of APTITUDE would share the same IB odds ratio as their tracked counterparts at the 35th percentile of APTITUDE, while detracked students at the 45th percentile of APTITUDE would share the same IB odds ratio as their tracked counterparts at the 56th percentile of APTITUDE. Figure 4 demonstrates the positive effect of detracking for all demographic groups in this sample, based on Model 9. The plot in Figure 4 represents the likelihood of IB diploma attainment at various levels of APTITUDE for both tracked and detracked cohorts. The detracked cohort has a greater likelihood of receiving the IB diploma at virtually every level of APTITUDE. Figure 4. EXPLORATION OF OTHER POTENTIAL INFLUENCES ON THE OUTCOME As the school detracked, students were expected to pass more rigorous courses and examinations. Could it be that the increase in the proportion of students graduating with Regents and/or IB diplomas was the result of fewer students graduating overall? In other words, was the increased rigor of the detracked curricula associated with student discouragement and an increase in “dropping out” of high school? In order to answer this question, we examined the district’s dropout rates from 1996 to 2005. We found that progressive detracking was not associated with more students leaving school prior to graduation. The reverse was true – detracking was associated with a decrease in the rate of students dropping out of school. Table 7. Dropout rates 19992005
To put this rate in a statewide perspective, only 67% of all public high school students in New York State who entered ninth grade in 2000 graduated in 2004. In the school of study, 98% of all students who entered high school in 2000 graduated in 2004. Of the remaining five students, two were developmentally delayed students who will remain until the age of 21, one student dropped out, and the remaining two students graduated one year late, in 2005. It would not appear, therefore, that the increase in the rigor of coursework led to students being left behind or being pushed out of school. We also considered the possibility that the school’s rise in diploma rates reflects a broader trend of increases in Regents diploma rates, or that the district of study may have begun with an unusually low rate and then dramatically increased as Regents examinations became high school exit exams for New York State students. To test this hypothesis, we compared the Regents diploma attainment rates of the district’s students with all students in New York State and with students in similar schools. Between the years of 2000–2002, there was a sharp increase (48% to 56%) in the attainment of Regents diplomas by graduates of New York State Public Schools, as the state phased in earning a score of 55 on selected Regents examinations as a graduation requirement for nonspecial education students. The district of study’s increase during those early years was smaller (84%–88%). During the years (2002–2004) that the progressively detracked cohorts began to graduate, however, increases in the Regents diploma rate statewide were substantially smaller (56%–57%), but the rate for the district of study in the same time period accelerated (88%–94%). But what about suburban schools with resources similar to the school of study? New York State categorizes districts and schools by a ratio of needs to resources, thus creating similar groups of districts and schools. The district we studied belongs to Group 6, which is described by New York State as districts that serve students with low student needs in relation to district resource capacity. Its high school belongs to Group 54 – secondary schools in Group 6 that have relatively high student needs (New York State Board of Regents, 2003). Mirroring statewide trends, in Group 54 there was a sharp increase in the average Regents diploma rate between 2000–2002 (66%–77%) followed by an increase of only one percentage point from 2002 to 2004 (77%–78%), the years in which the Regents diploma rate at the school of study rate increased by 6 percentage points.^{11} More telling, perhaps, is the comparison in growth of the earning of Regents diplomas by African American and Latino students during those three years. Such students who were members of progressively detracked cohorts experienced dramatically increases in earning Regents diplomas, from 52% in 2002 to 83% in 2004 (Burris & Welner, 2005). Detracking proved to be an effective strategy for “closing the gap” in Regents diploma attainment. To put this rate in perspective, according to a 2004 New York State report, of those students who graduated in 2003, 23% of Black students and 26% of Hispanic students earned Regents diplomas (Mills, 2004). And these dismal numbers were calculated using as a denominator only those students who received a high school diploma. The official New York State dropout rates for that cohort were 14% (Black students) and 17% (Hispanic students), and an additional 6% and 5%, respectively, transferred to GED programs (Mills). LIMITATIONS OF THE STUDY Two potential limitations of this study are its quasiexperimental design (Cook & Campbell, 1979) and its generalizability. As explained recently in a National Research Council publication, the interrupted timeseries quasiexperimental approach used here, “represents a relatively strong research design that is often able to provide internally valid evidence about the causal effects of an intervention” (Commission on Behavioral and Social Sciences and Education, 1998, p. 15). This strength is in part due to the fact that “intervention studies generally fulfill the temporal ordering criteria (i.e., the cause precedes the effect)” (Commission on Behavioral and Social Sciences and Education, 1998, p. 15). However, because this was not a true experiment, we cannot categorically attribute all of the increases in the earning of the two diplomas to detracking alone. While we attempted to account for other factors in the previous section, some of the increases in the probability of earning Regents and IB diplomas could conceivably reflect other, unaccountedfor influences not considered by the authors. Another potential limitation of this case study concerns the generalizability of the findings reported here. The district that implemented this reform has historically allocated generous resources to students who struggle, and has the resources to attract highly qualified teachers. Both before and after detracking, however, there were support classes, extra help periods, and a highly qualified faculty. Prior to detracking such support was not enough. However, the combination of detracking and support was likely an important factor in the success of this reform. A reasonable deduction is that replication of its success should include both elements. Another key to the implementation of such a reform concerns values and commitment. A successful equityminded reform, such as the one described in this article, depends on school leaders’ willingness to challenge longstanding practices and assumptions (Sirotnik & Oakes, 1986). Within the district there were shifts in beliefs, curriculum, pedagogy and school culture, changes that accompanied the mechanics of detracking and that educators at the school have seen as essential to the growth in both Regents and IB diplomas. While an explanation of the role of all of these factors in a detracking reform is beyond the scope of this study, it would be incorrect to assume that achievement gains will be realized simply by eliminating tracks. Educators need to sincerely hold and communicate a belief—supported by this research—that many more students can achieve much more if they have the proper curriculum, teaching, and support. The district’s commitment to reform also manifested itself in the reform’s breadth. The detracking reform was part of a longterm district strategy. There is only one middle school in the district, and that middle school is now also detracked. One might imagine that implementation of this reform in a large district with several feeder middle schools would be more difficult and would require additional strategies for success. Taken together, this district’s experience will be most generalizable to districts that share basic values, and that are willing to challenge traditional perspectives and attitudes regarding socalled “ability”^{12 }and learning. Also needed are the resources that must be dedicated in order to provide support to faculty, students, and even parents. Would detracking be as effective in a district with fewer resources to support struggling students, fewer qualified teachers, or in a district in which more students struggle academically? Certainly such conditions would make the reform more difficult to implement. However, in our opinion, such challenges can be at least partially overcome. Implementation will differ in each new context. Gains may even be reduced. But there is little reason to believe that districts with greater numbers of poor students would not gain achievement benefits from comparable detracking initiatives. In fact, a recently completed longitudinal study in an urban American high school with a far greater proportion of students from lowincome households shows results that are remarkably similar to those of this study—when detracking was combined with a common rigorous curriculum in mathematics, student achievement increased (Boaler & Staples, this issue). Similar results were found in a longitudinal study of two high schools in England (Boaler, 2002). CONCLUSION The title of a 1999 article by a prominent advocate of tracking asks, Will Tracking Reform Promote Social Equity? (Loveless, 1999a). The article challenges researchers to demonstrate two benefits of detracking—that reformed schools close the gap between education’s “haves” and “have nots” and, importantly, that they do so without adversely affecting the learning of the “haves.” Responding to the first element of that challenge, this article offers a case study showing a dramatically closed achievement gap in the earning of the Regents diploma. Detracking by itself cannot ameliorate social inequities such as poverty, inadequate health, and underfunded urban schools – inequities known to have a deleterious effect on student achievement (Berliner, 2005; Rothstein, 2004). Yet schools also can do a great deal to provide all students with fair access to the best curricula, teachers and instruction that they have to offer. Numerous studies, both past and present, tell us that the best resources are usually dedicated to schools’ high track classes (Haycock, 2000; Oakes, 2005; Oakes, et al., 1990). Within a particular school, then, detracking reform can address inequities in educational opportunity. Moreover, responding to the second element of Loveless’ challenge, this longitudinal case study demonstrates that a wellexecuted detracking reform can help increasing numbers of students reach state and worldclass standards without adversely affecting highachieving students. As shown in Table 2, the percentage of students who scored the highest scores on IB exams (5, 6 and 7) increased even as the enrollment in IB classes expanded from an exclusive gifted program to a program for the majority of students. The findings from this study should help to alleviate the concerns of those who fear that high achievers will learn less if they are placed in classes with lowachieving students and that lower achievers will be frustrated when given hightrack curriculum (Brewer, Rees, & Argys, 1995; Kulik, 1992; Loveless, 1998, 1999a). Our findings with regard to those students who had been lower achievers are consistent with what researchers know about the potential of accelerated curriculum and the damage done by rote curriculum (Adelman, 1999; AERA, 2004; Levin, 1997; Singham, 2003). These findings are noteworthy nevertheless, because of the impressive, documented improvement in their academic outcomes. We are not naïve enough, however, to fail to recognize that, as a political and policy matter, the more important finding of this study is the continued success of the students who had been highachievers. As evidenced by their performance on IB examinations, and in the earning of the IB diploma, high achievers continue to successfully meet international standards. Case studies such as this, documenting success and grounded in carefully collected and analyzed data, are now emerging and should give confidence to future reformers (Boaler & Staples, in this issue). Whether measures of accountability are established by states or by federal legislation, such as NCLB, educators are currently presented with the challenge of helping all students, including lowachieving students, meet high learning standards. Increased student achievement is possible, but will not happen without improvements in classroom instruction. DarlingHammond (2003) concludes that, in order to meet challenging accountability goals, American students must have access to highquality curriculum, teaching, and resources (see also Wells & Oakes, 1996). Overall adequacy of resources, however, is no more important than the distribution of those resources. The case study presented here shows that combining hightrack curriculum with detracked classes can have a positive impact on helping students achieve on measures that matter. Notes 1 The authors of this article include the high school’s principal and the facilitator of the school’s IB program. 2 This is the cohort of students who would normally graduate in June 2003. We use ninthgrade YOE to identify the students because a small number of students take 4½ or five years to graduate. Because our concern is the particular phase of the detracking reform that a student experienced, the YOE approach is the most accurate. 3 The high school has a program for developmentally delayed students who receive an IEP certificate and exit high school at the age of 21. These students have a specially designed program that combines academics with job skill training. They were not included in this study. The number of such students who are developmentally delayed is small—typically less than four students per cohort. 4 In order to include data from the final year, we used the old, more rigorous standard (as described in the main text) for those cohort members. 5 A fiveyear sequence in the arts or business may be substituted for the courses and examination in foreign language. 6 For an extensive discussion of the grading practices of the IB program see Diploma Programme assessments: Principles and practice available online at: http://web3.ibo.org/ibis/documents/dp/d_x_dpyyy_ass_0409_1_e.pdf 7 The IBO, which was established in 1968, is a nonprofit foundation that serves the needs of 1,468 member schools who offer one or more of its three courses of study known as the primary years, middle years and diploma program (IBO, 2005). 8 African American and Latino students are nationally underrepresented in hightrack classes (Oakes, Gamoran & Page, 1992). 9 The GROUP4 variable actually serves as the null case and is not entered into any statistical model. 10 That is, the chisquare change, with 7 degrees of freedom, is 26.09, which is significant at the 0.001 level. 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