The author attacks not only the racism inherent in existing IQ tests, but the very concept of a standardized intelligence test, which, he asserts, lacks certain basic criteria of consistency and validity necessary to a scientific device. Part of a theme issue on intelligence. (SJL)

Intended as a nontechnical review of current scientific knowledge in the field, this essay considers the nature of primary and secondary intellectual abilities, plus the major features of, and the development of individual differences in, the skills and capacities constituting intelligence. Part of a theme issue on intelligence. (Author/SJL)