The focus of the Abraham Jacobs Memorial Symposium was the rehabilitation of the mentally retarded. In "Predictive Studies of Vocational Adjustment," Henry V. Cobb and Shirley Epir discuss (1) the history of treatment of the retarded in the United States, (2) problems in predictive research with the retarded, and (3) difficulties in the application of research findings. In "Vocational Preparation of the Retarded During School Years," Evelyn Deno presents implications for school planning discovered in a research and demonstration project with the Minneapolis Public Schools. Two implications cited are (1) The curriculum and methods used in the conventional special-class program need to be redesigned, and (2) More service options should be provided because of diversity of needs among school-age retarded. In "Work-Study Programs for the Mentally Handicapped," Merle B. Karnes describes a Champaign, Illinois, program with classes at the elementary, junior high, and senior high levels. In "Longitudinal Follow-Up Studies of Community Adjustment," Don C. Charles discusses the usefulness of longitudinal research with the mentally retarded. In "Key Political and Cultural Factors Influencing Services for the Retarded in Western Europe and the United States," David D. Komisar compares programs in other countries with those in the Unites States. (CH)