This report summarizes the available research on open/informal education. The introduction discusses the assumptions which underlie open education and presents definitions and descriptions of open education. The body of the report examines 30 studies of open education and reports findings with regard to student achievement, student self-concept and self-esteem, student behavior, student attitudes and responses to open education, teacher attitudes and morale, teacher characteristics, parent and community reactions, and cost effectiveness. Findings of the studies are varied and sometimes contradictory. The document includes seven data tables and an eight-page bibliography. (HMD)