Noting that growing evidence indicates that high-quality preschool child development programs contribute to the short and long-term development of children living in poverty, this digest summarizes recently reported experimental and quasi-experimental studies of Head Start and similar programs. Recently reported experimental studies include those…

In educational research and evaluation, a sample of subjects usually received some type of programmatic treatment. Outcome scores for these students are then compared with outcome scores of a control or comparison group. M. Lewis and H. McGurk (1972) have pointed out that there are some implicit assumptions when this approach is applied to…