The Long-Term Effects of Small Classes in Early Grades: Lasting Benefits in Mathematics Achievement at Grade 9

Reducing class size to increase academic achievement is a policy option currently of great interest. Although the results of small-scale randomized experiments and some interpretations of large-scale econometric studies point to positive short-term effects of small classes, some scholars view the evidence as ambiguous. Project STAR in Tennessee-a 4-year, large-scale randomized experiment on the effects of class size—provided persuasive evidence that small classes have immediate positive effects on academic achievement. Unlike most other early education interventions, these effects persisted for several years after the children returned to regular-sized classes. The authors of the present article report analyses of a 6-year follow-up of the students in that experiment. Class-size effects persisted for at least 6 years and remained large enough to be important for educational policy. The results suggest that small classes in early grades have lasting benefits and that those benefits are greater for minority students than for White students.     

Class Size and Student Performance at a Public Research University: A Cross-Classified Model

This study addresses several methodological problems that have confronted prior research on the effect of class size on student achievement. Unlike previous studies, this analysis accounts for the hierarchical data structure of student achievement, where grades are nested within classes and students, and considers a wide range of class sizes across various disciplines. Based on data from undergraduate class sections at a single institution, the study provides consistent evidence of a negative effect of class size on grade performance, most substantially affecting the achievement of “A” grades with lesser effect on grades of “C” or higher. Because models with logarithmic specification show superior fit, this study also demonstrates that the effect of class size on students’ final grades diminishes as the class size increases. These findings suggest that a larger impact on student performance could be attained by further trimming enrollment in small classes than by reducing class size overall.     

Evidence that class size matters in 4th grade mathematics: An analysis of TIMSS 2007 data for Colombia

Like students in most developing countries, Colombian students in 4th grade performed poorly in the TIMSS 2007 test of mathematics skills, achieving an average score of 355 relative to an international mean of 500. After controlling for other factors and misreporting error, I find that large classes have substantial adverse effects on student achievement. Increases in class size from 20 to 53 students reduce test scores by about 80 points, or 2.4 points for each additional student in the class. Most likely this is the cumulative effect of class size in grades one to four on achievement in 4th grade.     

High-Ability Grouping: Benefits for Gifted Students’ Achievement Development Without Costs in Academic Self-Concept

Effects of full-time ability grouping on students’ academic self-concept (ASC) and mathematics achievement were investigated in the first 3 years of secondary school (four waves of measurement; students’ average age at first wave: 10.5 years). Students were primarily from middle and upper class families living in southern Germany. The study sample comprised 148 (60% male) students from 14 gifted classes and 148 (57% male) students from 25 regular classes (matched by propensity score matching). Data analyses involved multilevel and latent growth curve analyses. Findings revealed no evidence for contrast effects of class-average achievement or assimilation effects of class type on students’ ASC. ASC remained stable over time. Students in gifted classes showed higher achievement gains than students in regular classes.     

Class Size and Teacher Quality

The `Vinson Report' on Public Education in NSW has become received wisdom. The report's recommendation on class sizes has attracted more attention than any other. This is unfortunate because it is on this issue that the Report is weakest. A thorough appraisal of the research on class sizes reveals that many studies have methodological problems that make their application in a real world context doubtful; many studies have introduced other reforms such as curriculum changes at the same time as class size reduction, making their individual effects impossible to determine; the large majority of studies have found no significant effects of class size on student achievement, while the remainder have shown small benefits, usually only when classes have less than 20 students; class size has less effect when teachers are competent; and the single most important influence on student achievement is teacher quality. Research shows unequivocally that it is far more valuable, both in educational and fiscal terms, to have good teachers than lots of teachers. It must be ensured that the current and incoming teaching force is the best it can be, before seeking to expand it.Key Words: child development, class size, public education, student achievement, teacher quality, teaching methods     

Are class size differences related to pupils' educational progress and classroom processes? findings from the institute of education class size study of children aged 5–7 years

Abstract Despite evidence from the USA that children in small classes of less than 20 do better academically there is still a vociferous debate about the effects of class size differences in schools, and considerable gaps in our understanding of the effects of class size differences. This article summarises results from the most complete UK analysis to date of the educational consequences of class size differences. The study had two aims: first, to establish whether class size differences affect pupils’ academic achievement; and second, to study connections between class size and classroom processes, which might explain any differences found. The study had a number of features that were designed to be an improvement on previous research. It used an ‘observational’ approach, rather than an interventionist one, in order to capture the nature of the relationship between class size and achievement across the full range of observed classes, and it employed a longitudinal design with baseline assessment to adjust for possible non‐random selection of children into classes. The study followed a large sample of over 10,000 children from school entry through the infant stage, i.e. children aged 4–7 years. It used multilevel statistical procedures to model effects of class size differences while controlling for sources of variation that might affect the relationship with academic achievement, and a multimethod research approach, integrating teachers’ judgements and experiences with case studies, and also carefully designed time allocation estimates and systematic observation data. Results showed that there was a clear effect of class size differences on children's academic attainment over the (first) Reception year. In the case of literacy, the lowest attainers on entry to school benefited most from small classes, particularly below 25. Connections between class size and classroom processes were examined and a summary model of relationships presented. Effects were multiple, not singular; in large classes there are more large groups and this presented teachers with more difficulties, in smaller classes there was more individual teacher contact with pupils and more support for learning, and in larger classes there was more pupil inattentiveness and off‐task behaviour. Results support a contextual approach to classroom learning, within which class size differences have effects on both teachers and pupils. It is concluded that much will depend on how teachers adapt their teaching to different class sizes and that more could be done in teacher training and professional development to address contextual features like size of class.     

The Relationship between Increasing Enrolment and Student Academic Achievement in Higher Education

This article reports on a study of which the main aim was to provide insight into whether increasing the enrolment of large classes influences student academic achievement at the University of KwaZulu-Natal (UKZN), City, South Africa. The massification of higher education has led to greater numbers of students being enrolled in contact programmes. there is a widely accepted inverse relationship between class size and academic achievement for small class sizes and it would be speculative to extend the same understanding to larger class sizes. It is within this context that a cross-sectional study was conducted during which student achievement was analysed against increasing the enrolment of already large classes, in selected undergraduate modules at UKZN over a period of four years. convenience sampling and judgemental sampling were used to select modules in the discipline of Supply Chain Management (SCM). The findings revealed that while the average class size increased significantly, the pass rates remained constant. Based on the study findings, it was concluded that an increase in the enrolment of already large classes does not influence student academic achievement. It is recommended that the study be replicated in other schools and faculties where disciplines have experienced similar increases in the enrolment of large classes, thereby presenting an opportunity to either validate or dispute the study results. It is further recommended that the role of peer effects be subjected to further study to establish whether they have any influence on academic achievement. These results are expected to encourage future debate on how faculties manage increasing student enrolments at higher education institutions.     

The relationship between teaching practices and student achievement in first year classes

This study investigated the links between the teaching practices of primary school teachers (n = 200) who were observed while presenting a new text to their first year classes, and the student achievement levels in those classes. The teaching practices are specifically concerned with the way the teachers supported and encouraged students’ activities during verbal interactions. Two different populations were observed: classes of first year students with a reduced teacher–student ratio (about ten students per class) and classes with a normal teacher–student ratio (between 20 and 25 students per class). We found that the average level of student achievement in the reduced size classes was higher than in the standard size classes but that teaching practices differed only at precise periods of group or individual introduction to new reading texts. In these periods, we found links between teaching practices and student achievement.     

The effect of schools and classes on language achievement

Abstract This study addresses the effects of secondary schools and classes on language achievement in Flanders, Belgium. The results of a three‐level analysis (students within classes within schools) indicate that the group composition at the class level is very important. In classes with a high average initial cognitive ability or a large proportion of girls, the language achievement is higher. These compositional effects are discussed with reference to type ‘A’ and type ‘B’ effects. The analyses show that group composition is more important than educational practices in accounting for differences in language achievement. With whom one is taught has a larger impact than how one is taught. Indications of differential effectiveness of classes related to prior achievement were found, with greater variations in effectiveness between classes for pupils of low prior achievement.     

“人以群分”适用于大学生的学业成就吗——基于社会网络分析和Meta分析的方法

嵌入班级网络中的大学生在交往中形成不同的小群体,这些小群体间的学业成就是否具有显著性差异?研究者将社会网络分析方法中的整体网分析与元分析(Meta分析)相结合,在对大学生班级内小群体的学业成就差异进行多项独立研究的基础上,运用元分析技术将29项研究(N=1076)的结果予以综合分析,得到如下结论:(1)每个班级的大学生都在互动过程中形成了不同数量的小群体,且每个小群体中的学生数量不同;(2)大学生学业成就存在着“人以群分”现象,即同一班级的大学生在互动中产生的小群体在学业成就上存在显著性差异。因此,大学生应加强与高学业成就水平的小群体之间的互动以提高学业成就;而高校管理者也应采用科学的方法识别班级中的不同小群体,从而采取相应的学业成就提升策略。     

Estimating the distributional effects of education reforms: A look at Project STAR

Most evaluations of education policies focus on their mean impacts; when distributional effects are investigated it is usually by comparing mean impacts across demographic subgroups. We argue that such estimates may overlook important treatment effect heterogeneity; in order to appreciate the full extent of a policy's distributional impacts one should also exploit alternative methods. We demonstrate this using data from Project STAR, where we find evidence of substantial treatment effect heterogeneity across achievement quantiles. While all children appear to benefit from being placed in small classes, the largest test score gains are at the top of the achievement distribution. This result seems to be at odds with previous evidence that smaller classes benefit disadvantaged children most, but the discrepancy is reconciled by the fact that there are similar patterns of treatment effect heterogeneity within demographic groups, and that gains for disadvantaged students are larger throughout much of the achievement distribution.     

Combination Classrooms Revisited

In their box score review, Mason and Burns (1997) conclude that while comparisons of combination and single‐grade classes show no general differences in student achievement, combination classes nevertheless have a small negative effect. Based on the results of a best‐evidence synthesis (Veenman, 1995) and a meta‐analysis of an extensive and international research base (Veenman, 1996), I argue that there is no empirical evidence at this moment showing student learning to suffer in combination classes. Mason and Burns also conclude that the negative instructional effects characteristic of combination classes are compensated for by placing better students and teachers in combination classes. On the basis of my best‐evidence synthesis and meta‐analysis, however, I can find no indication of the selection bias suggested by Mason and Burns.     

Why Should We Group Students Within-Class for Learning?

The purpose of this article is threefold. First, we bring to the attention of the European and international research community the research evidence concerning within-class grouping. In a previous quantitative review, we computed 103 independent effect sizes from studies comparing within-class instruction and whole class instruction. The mean weighted effect size (ES) of within-class versus no grouping on student achievement was 0.17, which was significantly greater than zero (p < .05). We also reported that the findings were statistically heterogeneous and explored which of 26 study features accounted for the variability. Second, we address the issues related to our research integration raised by Prais (1998, 1999). We argue that our review focused only on grouping effects on students, not other features of classroom organization or teacher outcomes. We also believe that our data suggest that Continental Education would be further enhanced by the use of small group instruction. In particular, our findings are: useful; not so variable as to be meaningless; provide evidence of beneficial effects for students of all relative abilities; are thorough and detailed; and provide a rather complete picture of the available evidence. Third, we elaborate further on the pedagogical techniques which encourage effective small group instruction. We describe cooperative learning in general, the important elements of positive interdependence and individual accountability in particular, and summarize reviews of research on its effectiveness. We remain convinced that educators should group students within-class for learning and rely on the research evidence for guidance in doing so.     

Class size effects on reading achievement in Europe: Evidence from PIRLS

Some researchers have suggested that reducing class size may result in increases in student achievement. However, the empirical evidence about class-size effects from experimental or quasi-experimental studies has been mixed overall. This study sheds more light on whether class size reduction impacts reading achievement in eight European countries: Bulgaria, Germany, Hungary, Italy, Lithuania, Romania, Slovakia, and Slovenia. We examine class size effects on reading achievement using national probability samples of fourth graders. All eight European countries had participated in the Progress in International Reading Literacy Study (PIRLS) in 2001, 2006 and 2011. Overall, the results indicate that class size effects on reading achievement are not significant across countries and years. One exception was Romania where class size effects in 2001 and 2011 were significant and negative suggesting that reducing class size corresponded to increases in reading achievement. Trends in class size effects over time were not observed.     

The effect of grouping of laboratory students on selected educational outcomes

The purpose of this study was to discover if grouping students in the laboratory on the basis of their formal reasoning ability affected (1) their science content achievement, (2) their formal reasoning ability, (3) the learning environment in the laboratory, and (4) the relationships between individuals in a particular group. The laboratory groups for three physical science classes for preservice elementary teachers were arranged as follows: (1) one class with students of unequal reasoning ability grouped together, i.e., one highly developed formal reasoner per group (the heterogeneous group), (2) one class with students of similar reasoning ability grouped together (the homogeneous group), and (3) one class arranged in groups according to the desires of the class members (the student choice group). The three classes were compared using pre-and post-scores on content and formal reasoning instruments and scores for classroom environment and social relationships. Results indicated that the groupings as described had significantly different effects on science content achievement but not on any of the other questions posed above. The students in the class with laboratory teams grouped by student choice had significantly lower science content scores than the students in the classes with teams formed using either the heterogeneous or homogeneous grouping procedures. The difference between the heterogeneously and homogeneously grouped classes was not significant at the 0.05 level.     

Does it pay to be one of the oldest in class? Relative age effects on academic self-concept,peer relations,and teacher judgments in German primary schools

Several studies have revealed that older students in a year group reach higher achievement scores than younger students in that group. But less is known about how students' relative age in class relates to their self-perception of academic achievement, their social acceptance in class and to how teachers judge their abilities. Therefore, we examined relative age effects within class on students' academic self-concept, peer relations, grades, and teachers’ secondary school recommendation. Analyses were based on a sample of N = 18,956 German fourth graders, who had never been retained or accelerated. We applied multilevel regression to control for covariates at the individual and classroom level. There were no substantial relative age effects within class across any of the outcomes, except for a small advantage for the youngest in their reading self-concept. Our findings therefore contradict the common assumption that younger students in class are disadvantaged compared to their older classmates.     

Big-fish-little-pond social comparison and local dominance effects: Integrating new statistical models,methodology, design,theory and substantive implications

We offer new theoretical, substantive, statistical, design, and methodological insights into the seemingly paradoxical negative effects of school- and class-average achievement (ACH) on academic self-concept (ASC)—the big-fish-little-pond-effect (BFLPE; 15,356 Dutch 9th grade students from 651 classes in 95 schools). In support of the theoretical, social-comparison basis of the BFLPE, controlling for direct measures of social comparison (subjective ranking of how students compare with other students in their own class) substantially reduces the BFLPE. Based on new (latent three-level) statistical models and theoretical predictions integrating BFLPEs and ‘local dominance’ effects, significantly negative BFLPEs at the school level are largely eliminated, absorbed into even larger BFLPEs at the class level. Students accurately perceive large ACH differences between different classes within their school and across different schools. However, consistent with local dominance, ASCs are largely determined by comparisons with students in their own class, not objective or subjective comparisons with other classes or schools. At the individual student level, ASC is more highly related to class marks (from report cards) than standardized test scores, but the negative BFLPE is largely a function of class-average test scores. Consistent with theoretical predictions, BFLPEs generalize across objective and subjective measures of individual ACH, and BFLPEs are similar for the brightest and weakest students.     

Inclusive education and students without special educational needs

Background:?In the debate on inclusive education, students without special educational needs (SEN) are an important topic. However, there is a lot unknown about differences between these typical students in inclusive and non-inclusive classes. For example, the neutral results that are often found in earlier research could be caused by positive effects for some students, and negative effects for others.

Purpose:?This study investigated whether there is a relation between inclusive education and the academic achievement and socio-emotional functioning of typical students, and, more importantly, whether inclusive education affects the achievement and socio-emotional functioning of more and less intelligent typical students differently. Furthermore, we investigated whether differences occur by type of SEN of the included students. Here, we made a distinction between students with behavioural, cognitive and other problems.

Sample:?A representative sample of 27,745 students without SEN in Dutch primary education from a large cohort study in the Netherlands was used.

Design and methods:?Language and arithmetic tests were used to assess academic achievement. For socio-emotional functioning, both teacher and student questionnaires were used. A non-verbal IQ test was used to assess student intelligence. Based on the number of students with diagnosed SEN, the students without SEN were divided into several groups: typical students with no, a few and more than a few students with (certain types of) SEN in their class. Multi-level regression analyses were used to compare these groups.

Results:?For academic achievement, no differences were found between students without SEN in inclusive and non-inclusive classes. In this, we found no differences between intelligent and less intelligent typical students. For socio-emotional functioning, some differences were found, but the practical importance of these differences is unclear, since the effect sizes were small. The functioning of typical students does not meaningfully differ by type of SEN of the included students.

Conclusions:?The findings of this study are interesting in the light of the ongoing inclusion debate. Arguments against inclusive education often concern an assumed adverse effect on typical students. As in this study, hardly any differences were found between typical students in inclusive and non-inclusive primary school classes, this research strengthens the scientific evidence in support of inclusive education.     

Classroom composition and peer effects

This chapter examines the extent to which the composition of classes affects learning outcomes. The aim is to explore peer effects when students are organized into classes on the basis of ability, ethnicity, or gender, as well as the effects of multigrade and multi-age classes and class size. The argument is defended that these composition factors affect only the probability that differential instruction and learning occur and that, at best, their influences are indirect. Teachers appear not to change their teaching activities when class composition is changed and most often the power of peer effects is rarely realized. Any direct effects of class composition are less related to learning outcomes and more related to equity and expectation effects by teachers and other participants (students, parents, and principals). Whether a school tracks by ability or not, reduces class sizes, implements multigrade/multi-age or single-level classes, or has coeducational or single-sex classes, appears less consequential than whether it attends to the nature and quality of instruction in the classroom, whatever the between-class variability in achievement. The learning environments within the classroom, and the mechanisms and processes of learning that they foster, are by far the more powerful. Good teaching can occur independently of the class configuration or homogeneity of the students within the class.     

Social capital in the classroom: a study of in-class social capital and school adjustment

Social capital is generally considered beneficial for students’ school adjustment. This paper argues that social relationships among pupils generate social capital at both the individual and the class levels, and that each has its unique effect on pupils’ performance and well-being. The sample in this study consists of 1036 children in 60 first-grade classes in 46 Dutch elementary schools. Multilevel regression results show that a substantial proportion of the variance in school adjustment can be attributed to the class level and that both individual-level and classroom-level social capital have substantial effects on school adjustment. At the individual level, the size of one’s network is more important than its structure. At the collective level, social capital also has a ‘dark side’ because it can have negative effects on adjustment, lowering the academic performance in a class.