ABSTRACT
This chapter describes the research design, and focuses on the nature of selection and attrition effects in the samples. It presents data on the academic test performance of children after the termination of all intervention. The chapter explores data on school grades, school attendance and the interview measure and presents data for low income children and for academic measures only. In the fall of 1967 the Yale research group began a study of kindergarten-aged children who had just completed Head Start and who were enrolling in a special continuing intervention program, Project Follow Through, in Hamden, Connecticut. For each test at each test period the child's performance was converted into a z-score in comparison with the other children of the same sex and experimental group. The implication is that an intervention program can continue to show its effects even after the children have returned to their regular school programs.
