The study explored the effects of two kindergarten program organization factors--length of school day and class size--on kindergartners' reading, math and general knowledge achievement at the end of the kindergarten year. Two waves of data were drawn from the Early Childhood Longitudinal Study, Kindergarten Class of 1998-99 (ECLS-K) with an…

Although experimental results indicate that smaller classes promote higher achievement in early elementary school, the broader literature on class-size effects is inconclusive. This seeming contradiction raises questions about the generalizability of experimental evidence, an issue that this article addresses by examining the effects of class size…

A 3-YEAR EXPERIMENTAL PRIMARY-GRADE READING PROGRAM CONDUCTED WITH A 50 PERCENT REDUCTION OF READING CLASS SIZE WAS EVALUATED IN THE RIVERSIDE, CALIFORNIA, UNIFIED SCHOOL DISTRICT FOR THE YEARS 1962-1965. TEST SCORES WERE ANALYZED FOR 656 CHILDREN IN THE EXPERIMENTAL GROUP WHO HAD 2 OR MORE YEARS OF EXPERIENCE IN THE EXPERIMENTAL PROGRAM AND FOR…