Untangling the Evidence on Preschool Effectiveness: Insights for Policymakers

Research on early learning programs in the 1960s and 1970s revealed longlasting benefits, sparking investment in preschool programs. However, recent evaluations of two large preschool programs found mixed results, creating confusion about whether preschool programs can support student success. This report reviews these two studies and others in depth, and finds that when participants are compared to very similar students who did not attend preschool, the benefits of participation are typically found to be substantial.