This article examines changes in the research design, sample size, and precision between the planning phase and implementation phase of group randomized trials (GRTs) funded by the Institute of Education Sciences. Thirty-eight GRTs funded between 2002 and 2006 were examined. Three studies revealed changes in the experimental design. Ten studies…

The results of compensatory education (CE) were evaluated in 5 school districts distributed across the nation. These 5 districts represented a subsample of an earlier evaluation involving 11 districts. Data were gathered on the amount and type of CE and the achievement scores of the pupils participating in CE during the 1965-66 and 1966-67 school…

Detailed case studies of each of the 5 school district participating in an evaluation of compensatory education (CE) programs under Title I of the Elementary and Secondary Education Act of 1965 are contained in this volume. Technical features and the methodology used in the 1965-66 and 1966-67 school year programs are described. The description…