Discusses Project STAR, a four-year study of class size reduction on student achievement in the early elementary grades. The paper reviews research on class size, puts Project STAR in context, describes its design and introduces several articles noting research implications for policy debate about class size. (SM)

Four initiatives to reduce class size are before the California State Legislature--SB 1414, AB 2449, the Governor's proposal, and AB 2821. Three of them were influenced by the findings reported by Tennessee's Project Student Teacher Achievement Ratio (STAR). Project STAR is a longitudinal demonstration project that since 1985 has examined the…

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…