It is argued that external validity across situations and life stages cannot be obtained for any single measure of intellectual ability. Presented at 84th Annual Meeting of the American Psychological Association, Washington, 1976. (Author/PD)

The results of this study highlight the cognitive intellectual aspect of the speed of behavior. These findings supplement Hunt's studies of the relationships between speed of cognitive processing and performance of young adults on conventional tests, and emphasize the importance of cognitive speed for subsequent intellectual development. (Author)