This report presents a comprehensive preliminary analysis of how California's Class Size Reduction (CSR) initiative has impacted student achievement during the first 2 years of implementation. The analysis is based on complete student, classroom, and teacher records from 26,126 students in 1,174 classrooms from 83 schools in 8 Southern California…

Competing explanations of class size reduction effects on student academic achievement were tested using student, teacher, and school data collected from nearly 700 classrooms in over 70 schools during the first 3 years of implementation of California's (K-3) Class Size Reduction Program. Five major hypotheses were tested: (1) overall impact of…

Examined what actually transpires in California's reduced-size classrooms, using systematic classroom observations and teacher and student interviews at four elementary schools. Results indicated that, overall, teachers still used whole-class instruction (though they perceived they used varied instructional strategies). Most learning activities…

Reducing K-3 class size is highly recommended and broadly supported, though there are challenges with finding enough qualified teachers and providing enough classroom space. Research indicates that K-3 students in smaller classes do better academically, with minority and low-income students showing the greatest gains. The paper examines…