The Perry Preschool Project assessed longitudinal effects of a 2-year program consisting of a daily 3-hour cognitively oriented nursery, a weekly 90-minute home visit, and less frequent group meetings of the pupils' parents. Subjects consisted of 3- and 4-year-old Negro disadvantaged and functionally retarded children, whose pretest scores on the…

An overview is provided of the evaluation of the Lighthouse Project, an education enhancement project that began in one urban and two suburban districts. Its methodology was the context for showing how the focus on the results of a standardized achievement test in mathematics inhibited the implementation of mathematics reform in the elementary…