Class-size reduction is the subject of much debate in the education community. Findings from research studies on three top class-size reduction programs can help states and schools decide whether reducing class size will work for them. Provided are background information, research findings, and a prognosis for the future for Indiana's Project Prime Time, Tennessee's Project STAR (Student Teacher Achievement Ratio), and California's CSR (Class-Size Reduction) Program. (Contains 19 references.) (MLF)