An evaluation of 14 independent experiments in early intervention, conducted in the late 1950s and early 1960s, revealed program characteristics related to positive outcome: the early age at intervention; the higher adult-child ratio; and more home visits, direct participation of parents, and services for families. (Author/MLF)

Reviews the research on the effectiveness of five thinking skills training programs: Instrumental Enrichment, Philosophy for Children, Structure-of-Intellect (SOI), Problem Solving and Comprehension: A Short Course in Analytical Reasoning, and Odyssey. Compares and contrasts the content of each program and describes the relative lack of adequate…