Class Size Reduction Research Articles

The impact of a universal class-size reduction policy: Evidence from Florida's statewide mandate

Class-size reduction (CSR) mandates presuppose that resources provided to reduce class size will have a larger impact on student outcomes than resources that districts can spend as they see fit. I estimate the impact of Florida's statewide CSR policy by comparing the deviations from prior achievement trends in districts that were required to reduce class size to deviations from prior trends in districts that received equivalent resources but were not required to reduce class size. I use the same comparative interrupted time series design to compare schools that were differentially affected by the policy (in terms of whether they had to reduce class size) but that did not receive equal additional resources. The results from both the district- and school-level analyses indicate that mandated CSR in Florida had little, if any, effect on student achievement.

Do reductions in class size raise students’ test scores? Evidence from population variation in Minnesota's elementary schools

Many U.S. states and cities spend substantial funds to reduce class size, especially in elementary (primary) school. Estimating the impact of class size on learning is complicated, since children in small and large classes differ in many observed and unobserved ways. This paper uses a method of Hoxby (2000) to assess the impact of class size on the test scores of grade 3 and 5 students in Minnesota. The method exploits random variation in class size due to random variation in births in school and district catchment areas. The results show that reducing class size increases mathematics and reading test scores in Minnesota. Yet these impacts are very small; a decrease of ten students would increase test scores by only 0.04–0.05 standard deviations (of the distribution of test scores). Thus class size reductions are unlikely to lead to sizeable increases in student learning.

Estimating and Testing a Quantile Regression Model with Interactive Effects

This paper proposes a quantile regression estimator for a panel data model with interactive effects potentially correlated with the independent variables. We provide conditions under which the slope parameter estimator is asymptotically Gaussian. Monte Carlo studies are carried out to investigate the finite sample performance of the proposed method in comparison with other candidate methods. We discuss an approach to testing the model specification against a competing fixed effects specification. The paper presents an empirical application of the method to study the effect of class size and class composition on educational attainment. The findings show that (i) a change in the gender composition of a class impacts differently low- and high-performing students; (ii) while smaller classes are beneficial for low performers, larger classes are beneficial for high performers; (iii) reductions in class size do not seem to impact mean and median student performance; (iv) the fixed effects specification is rejected in favor of the interactive effects specification.

Can Small Class Policy Close the Gap? An Empirical Analysis of Class Size Effects in Japan

Can a smaller-class at school lead to a better educational outcome and more equality in achievement? We estimate the causal effects of class-size on achievement tests by using discontinuous changes in class-size under the Japanese public compulsory education system. We employ a value-added model using achievement test conducted at two different times during the same school year. Our results show a reduction in class-size has significant positive effects on Japanese language test scores in the sixth grade especially at schools in wealthy areas. That is, we find no evidence that a universal small-class policy closes the achievement gap among schools.

Longitudinal effects of class size reductions on attainment: Results from Hong Kong primary classrooms

In a four-year study of the effect of class size on pupil outcomes in a sample of 36 primary schools in Hong Kong, it has been found that there are few positive differences in attainment between classes set at less than 25 pupils and those of normal size averaging 38. Three cohorts of pupils were studied. In Cohort 1 pupils spent 3 years in small classes (from P1 to P3) while in Cohort 2 they spent two years (P1 and P2) before reverting to normal size in P3. Cohort 3 began in normal classes in P1 and continued to do so in the following P2 year.A series of multi-level models have been used to explore the effect on academic performance. Four different analyses are presented. In the first, pupils who spent three years in a normal class were compared with pupils from the same schools who spent two years in a small class before reverting to a normal class in Primary 3. The second analysis compared pupils in their third year of small class teaching with those in the same age group in normal classes. In the third comparison being in a small class for two years was compared with being in a normal class for a similar period The final comparison was between being in a small class for 3 years and being in a small class for only two years before reverting to a normal class in P3.Overall, the analysis showed no significant, consistent average effect either against sustained small class teaching or for it. However, in some schools remaining in small classes for three years led to a gain in attainment. The corollary to this is that for a similar number of schools there was a negative gain when classes return to normal in the third year of primary school.In all analyses boys tended to perform less well than girls. Motivation towards the study of Chinese, English and mathematics was always positively associated with attainment.

Do class size reductions make a difference to classroom practice? The case of Hong Kong primary schools

This paper describes changes which took place in 37 Hong Kong primary schools where class sizes were reduced from 38 to between 20 and 25. Chinese, English and mathematics classes were observed over three years from Primary 1 (aged 6) to Primary 3. For 75% of observations no child was the focus of the teacher's attention in large classes. Reducing the class size did not change this situation appreciably, although teachers claimed that smaller classes increased the amount of individual attention that pupils received. For some teachers cluster analysis did identify shifts in teaching methods away from whole class instruction and the implications of this finding for when Hong Kong ‘goes to scale’ across the primary phase are discussed.

The Court Versus Consent Decrees? Schools, Horne v. Flores and Judicial Strategies of Institutional Reform Litigation

Is the U.S. Supreme Court inviting litigants to take aim at unraveling injunctions in institutional reform litigation—especially consent decrees in the schools? In Horne v. Flores (2009), the court remanded a 17-year-old school reform case to a federal judge with orders to look beyond consent decrees on financing, reducing class sizes, and moving from bilingual education to structured English immersion—to look anew at whether the schools in Nogales, Arizona, provide equal opportunity. Those concerned with schools worry that the court has signaled the end of institutional reform litigation in the schools. However, we closely analyze these dense opinions and data tables to posit the court’s preference for a catalytic judicial strategy that may work best with institutional reform litigation. We place this analysis within a larger context of empirical studies of institutional reform litigation judicial strategies, including judicial roles of deferrer, director, broker, and catalyst. We also argue that these preferences demonstrate the court’s awareness of a sociolegal empirical literature on what works in institutional reform litigation—rather than the end of consent decrees in the schools.

How class size reduction mediates secondary students’ learning: hearing the pupil voice

This paper discusses the question of why and how class size can make a difference to teaching and learning from the students’ perspective. Secondary school contexts and, in particular, the students’ own voice on the issue of class size represent an under-researched area for class size studies. This paper draws on data from three case studies that examined secondary school English classes in Hong Kong (one large and one reduced-size class in each case). Both classes were of the same grade and taught by the same teacher. This paper positions the case studies within a broader context that focuses on class size and the processes that appear to be mediated by class size reduction. It also draws on interview data and findings from classroom observations. Notably, these data all suggest that students perceive smaller classes as being able to foster a greater sense of belonging and cohesion in their classroom, closer relations with teachers and enhanced participation levels in classroom activities. Crucially, findings also suggest that smaller classes can help to overcome some key cultural obstacles to learning such as language learning anxiety and the issue of ‘face’. Some implications for teachers, trainers and researchers are also presented.

Influences of Teaching Approaches and Class Size on Undergraduate Mathematical Learning

An issue for many mathematics departments is the success rate of precalculus students. In an effort to increase the success rate, this quantitative study investigated how class size and teaching approach influenced student achievement and students' attitudes towards learning mathematics. Students' achievement and their attitudes toward learning mathematics were compared across four treatments of a precalculus course. The four treatments were (a) traditional lecture-based structure, (b) traditional lecture-based structure with a reduced class size, (c) instruction that engaged students in problem solving, and (d) instruction that included opportunities for small collaborative groups. The achievement of students engaged in problem-based learning (PBL) was significantly higher than the other treatments. These findings suggest that undergraduates benefit from instruction that encourages reflection on prior knowledge while developing new ideas through problem solving. Surprisingly, students in the PBE treatment did not continue to outperform students in the other treatments in calculus. These findings suggest the need for longitudinal studies that investigate the long-term effect of teaching approach and small class size on student learning and student success in advanced mathematics courses.

The Effect of Class Size in Grades K-3 on Adult Earnings, Employment, and Disability Status: Evidence from a Multi-center Randomized Controlled Trial

Early education interventions have been forwarded as a means for reducing social disparities in income and health in adulthood. We explore whether a successful early education intervention, which occurred between 1985 and 1989, improved the employment rates, earnings and health of blacks relative to whites through 2008. We used data from Project STAR (Student Teacher Achievement Ratio), a four-year multi-center randomized controlled trial of reduced class sizes in Tennessee involving 11,601 students. Students were initially randomized within 79 schools to classes with 22-25 or 13-17 students. We linked subject records to Social Security Administration (SSA) earnings and disability data collected between 1997 and 2008-when the majority of subjects were between the ages of 18 and 28. We focused our analysis on annual, rather than cumulative, measures of earnings and employment because educational attainment after high school might reduce earnings through age 23. We considered three or more years of statistically significant positive (or negative) annual impacts to be a meaningful effect. Project STAR improved cognition and high school graduation rates. These benefits were primarily realized among low-income and minority students. These early education benefits did not translate into reduced disability claims in adulthood for treated subjects. However, exposure to small class size increased employment for blacks, and increased earnings for black males (p<0.05). Exposure to small classes also led to an increase in earnings for white males. However, white females exposed to small classes experienced a net decline in earnings and employment across the later years of follow up (p<0.05), offsetting any gains by white males. Exposure to small class size in grades K-3 appears to improve earnings and employment for black males and earnings for white males, while reducing employment and earnings among white females.

An examination of teachers’ perceptions and practice when teaching large and reduced-size classes: Do teachers really teach them in the same way?

Class size research suggests that teachers do not vary their teaching strategies when moving from large to smaller classes. This study draws on interviews and classroom observations of three experienced English language teachers working with large and reduced-size classes in Hong Kong secondary schools. Findings from the study point to subtle differences between teachers’ perceptions and their subsequent classroom practice. Implications for professional practice and development are presented.

Another Look at the Glass and Smith Study on Class Size

One of the most influential studies affecting educational policy is Glass and Smith’s 1978 study, Meta-Analysis of Research on the Relationship of Class Size and Achievement. Since its publication, educational policymakers have referenced it frequently as the justification for reducing class size.

Reclaiming Assessment through Accountability that is “Just Right”

BackgroundThis article builds on three years of qualitative research on Wisconsin's Student Achievement Guarantee in Education (SAGE) program, a class size reduction policy in Wisconsin.ObjectiveIn this article, we take a practice-oriented perspective on assessment, examining how assessments in schools that participated in a class size reduction program intersected with forces of accountability. The goal of this article is to broaden the understanding of what it means for schools and teachers to be held accountable for student learning and to discuss how different accountability frameworks affect instructional practices in classrooms.SettingThe research took place in nine elementary schools across South and Central Wisconsin.Research designData for the qualitative case studies were generated through multiple methods, including ethnographic observations, interviews, administration of the Classroom Assessment Scoring System (CLASS), document and artifact collection, and analyses of school-level standardized test scores.ResultsThe current political and educational context oriented our focus to an intersection of issues: the implementation of class size reduction, instructional practice, assessment, and accountability. We identify three aspects of assessment practices that affect this intersection: alignment, audience, and action.ConclusionsWe found that coherent and collaborative assessment practices were more likely to take place in schools where there were explicit connections through assessments to varied communities of interest: district, school, teachers, students, and families. In supportive assessment systems, teachers had tools that they understood and that they could use to improve their practice to meet the needs of their students. In contrast, assessment in lower quality classrooms took place in disjointed systems that focused primarily on summative rather than formative assessment. A focus on accountability without attention to the quality of instruction and the quality of assessment resources is inherently flawed.

When the Army Got Progressive: The Civil Affairs Training School at Stanford University, 1943–1945

They sat in the Cubberley Education Lecture Hall to hear visiting experts. More often they could be found meeting in reduced-size classes, or working on small-group activities. They usually took notes; sometimes they took field trips. They memorized lists and sat for exams, but they also watched films and acted out scenarios. Rather than take regular courses in the disciplines, they studied an integrated curriculum referred to as “Area Relationships.” Some faculty collaborated, team taught, and drew on students' prior knowledge. Even some administrators joined in the role-playing for the big culminating activity. The head of the program explained the reason for such a break from the traditional Stanford experience: “Special effort must be made to supply the student with points of view and methods of procedure which will enable him most quickly and most surely to survey a situation, analyze a problem, and formulate a solution.”

Experimental estimates of the impacts of class size on test scores: robustness and heterogeneity

Proponents of class size reductions (CSRs) draw heavily on the results from Project Student/Teacher Achievement Ratio to support their initiatives. Adding to the political appeal of these initiative are reports that minority and economically disadvantaged students received the largest benefits from smaller classes. We extend this research in two directions. First, to address correlated outcomes from the same class size treatment, we account for the over-rejection of the Null hypotheses by using multiple inference procedures. Second, we conduct a more detailed examination of the heterogeneous impacts of CSRs on measures of cognitive and non-cognitive achievement using more flexible models. We find that students with higher test scores received greater benefits from CSRs. Furthermore, we present evidence that the main effects of the small class treatment are robust to corrections for the multiple hypotheses being tested. However, these same corrections lead the differential impacts of smaller classes by race and free-lunch status to become statistically insignificant.

Class size, class composition, and the distribution of student achievement

Using richly detailed data on fourth‐ and fifth‐grade students in the North Carolina public school system, I find evidence that students are assigned to classrooms in a non‐random manner based on observable characteristics for a substantial portion of classrooms. Moreover, I find that this non‐random assignment is statistically related to class size for a number of student characteristics and that failure to control for classroom composition can severely bias traditionally estimated class size effects. Teacher‐fixed effects and classroom composition controls appear to be effective at addressing selection related to classroom composition. I find heterogeneity in class size effects by student characteristics – students who struggle in school appear to benefit more from class size reductions than students in the top of the achievement distribution. I find that smaller classes have smaller achievement gaps on average and that class size reductions may be relatively more effective at closing achievement gaps than raising average achievement; however, class size effects on both average achievement and achievement gaps are small.

The Effect of Small Class Sizes on Mortality Through Age 29 Years: Evidence From a Multicenter Randomized Controlled Trial

Limiting the number of students per classroom in the early years has been shown to improve educational outcomes. Improved education is, in turn, hypothesized to improve health. The authors examined whether smaller class sizes affect mortality through age 29 years and whether cognitive factors play a role. They used data from the Project Student Teacher Achievement Ratio, a 4-year multicenter randomized controlled trial of reduced class sizes in Tennessee involving 11,601 students between 1985 and 1989. Children randomized to small classes (13-17 students) experienced improved measures of cognition and academic performance relative to those assigned to regular classes (22-25 students). As expected, these cognitive measures were significantly inversely associated with mortality rates (P < 0.05). However, through age 29 years, students randomized to small class size nevertheless experienced higher mortality rates than those randomized to regular size classes (hazard ratio (HR) = 1.58, 95% confidence interval (CI): 1.07, 2.32). The groups at risk included males (HR = 1.73, 95% CI: 1.05, 2.85), whites/Asians (HR = 1.68, 95% CI: 1.04, 2.72), and higher income students (HR = 2.20, 95% CI: 1.06, 4.57). The authors speculate that small classes might produce behavior changes that increase mortality through young adulthood that are stronger than the protective effects of enhanced cognition.

The Causal Effect of Class Size on Academic Achievement

This article addresses three questions: Does reduced class size cause higher academic achievement in reading, mathematics, listening, and word recognition skills? If it does, how large are these effects? Does the magnitude of such effects vary significantly across schools? The authors analyze data from Tennessee’s Student/Teacher Achievement Ratio study (STAR) of 1985, where students and teachers are randomly assigned to a small or regular class. The authors propose a three-level multivariate simultaneous equation model with an instrumental variable (IV) and estimation via maximum likelihood (ML) to analyze the data under an assumption of data missing at random (MAR). The IV, random assignment of students to a small or regular class, reduces class size which, by hypothesis, improves academic achievement in these domains. The authors extend Rubin’s Causal Model (RCM) by involving a modified Stable Unit Treatment Value Assumption (SUTVA), requiring no interference between classrooms and intact schools. The method accommodates data with a general missing pattern and extracts full information for analysis from the STAR data. The authors investigate both homogenous and heterogenous causal effects of class size on academic achievement scores across schools. The results show that reducing class size improves reading, mathematics, listening, and word recognition test scores from kindergarten to third grade, although the effects appear relatively small in second grade. The authors find no evidence that the causal effects vary across schools.

Leading Inclusive ELL

Purpose: This article attempts to build a better understanding of the leadership necessary to create socially just schools for English language learners (ELLs) by addressing these questions: In what ways do principals create asset-based, collaborative, and inclusive learning opportunities and services for ELLs? What do varying approaches of these services and the leadership necessary look like in practice? Research Design: This article reports on the instrumental case studies of two urban elementary schools and the principals involved in school reform that resulted in inclusive ELL services. Findings: The first principal led her school to adopt a dual certification approach, where the staff engaged in professional development around ELL. They combined federal, state, and local resources to eliminate pullout ELL programs and reduce class size so elementary teachers would take sole responsibility for building community and instructing ELL and all students. The second principal led his school to adopt a coteaching approach where teams of general education and English as a second language (ESL) teachers planned as a team and cotaught all students. They eliminated pullout ELL services and focused on community building, professional development, and collaboration. Student achievement at both schools, and in particular the achievement of ELL students, greatly improved, as did the connection with ELL families. The cross-case analysis provides a comparison between the cases of inclusive ESL reform. Conclusions: The authors propose implications for school leaders that build on the literature, social justice leadership, and the work of the principals, staffs, and communities at the schools from the case studies described here.

THE SIERRA LEONE TEACHERS UNION: LABOR IN A POST-CONFLICT SOCIETY

The Sierra Leone Teachers Union (SLTU) has long played an important role in the country's education system and its labor movement. With more than 30,000 members, the SLTU is the largest and perhaps the most powerful union in Sierra Leone today. Nonetheless, the union struggles with challenges unheard of in developed countries. It represents teachers in an education system that was ravished by its eleven-year civil war (1991 to 2002). Not only are working conditions extremely difficult for teachers (classroom overcrowding, lack of educational materials, low pay, and often late pay), the union must negotiate union agreements with the Ministry of Education, which itself has no direct influence on the nation's coffers. Sierra Leone's Ministry of Finance and more importantly, the International Monetary Fund set policies that directly impact the quality of Sierra Leone's education system and its teachers.