Despite its failings, Herrnstein and Murray's "The Bell Curve" is valuable for emphasizing cognition as significantly affecting human performance and social achievement; acknowledging human differences; and offering a frightening depiction of contemporary American society. The authors err in reducing intelligence to a stable, immutable…

The effects of an instrumental enrichment program--designed to modify the cognitive structures of educable mentally retarded, disadvantaged, and other low-functioning adolescents--were studied with 114 Ss in both residential and day-care settings in Israel. (Author/DLS)