This Information Capsule examines the background and history in addition to research findings pertaining to class size reduction (CSR). This Capsule concludes that although educational researchers have not definitively agreed upon the effectiveness of CSR, given its almost universal public appeal, there is little doubt it is here to stay in some…

The cost-effectiveness of class size reduction (CSR) was compared with the cost-effectiveness of rapid formative assessment, a promising alternative for raising student achievement. Drawing upon existing meta-analyses of the effects of student-teacher ratio, evaluations of CSR in Tennessee, California, and Wisconsin, and RAND cost estimates, CSR…

Although class size reductions are often proposed as a way to improve student learning, research does not indicate that smaller classes will necessarily produce improved student achievement. Class size effects on student learning vary by grade, pupil characteristics, subject area, teaching method, and other learning interventions. References…

Project STAR (Student/Teacher Achievement Ratio) was a large-scale randomized trial of reduced class sizes in kindergarten through the third grade. Because of the scope of the experiment, it has been used in many policy discussions. For example, the California statewide class-size-reduction policy was justified, in part, by the successes of…

Most education research has confirmed that small classes yield benefits. Research also has revealed nuances about how and when small classes will work best, where an investment will result in maximum return, and exactly how many students a "small" class should have. The details of these findings can help policymakers strike a practical…

Tennessee's four-year Project STAR provided one-third class size reduction in early elementary school. Small class students in all types of schools scored significantly higher than regular class students in reading and math. The article discusses lessons learned and cost-effective ways to reduce class size. (SM)

This report presents results from an analysis of the long-term benefits and costs of Success for All (SFA), a school reform program that focuses on promoting early reading success among educationally at-risk students. The program was piloted and implemented in Baltimore elementary schools. This analysis tracks the educational outcomes through…

In this study we test the performance of some nonexperimental estimators of impacts applied to an educational intervention--reduction in class size--where achievement test scores were the outcome. We compare the nonexperimental estimates of the impacts to "true impact" estimates provided by a random-assignment design used to assess the…

This document provides the final summary report of Tennessee's primary school class size study, called Project STAR. Sections of the report concern: (1) background; (2) organization to conduct the study; (3) sample selection; (4) data collection plan and data base; (5) general operating guidelines; (6) teacher orientation; (7) study design; (8)…

This report presents results of Tennessee's 4-year longitudinal class size project: Student Teacher Achievement Ratio (STAR). The study analyzes student achievement and development in three class types: small classes with 13-17 students per teacher; regular classes with 22-25 students per teacher, and regular classes with 22-25 students per…