A reanalysis of a structural equation model of the development of intellectual abilities is presented. The original model emphasized four different constructs of intelligence; the reanalysis emphasized a general factor model. (Author/JKS)

In research conducted "over a period of 20 years" on aptitudes of high level personnel, the purpose was to analyze thinking abilities or processes into their unique components. The approach was through study of individual differences in performance on intellectual tasks varied systematically over broad ranges of psychological functioning.…

The study of ability factors in young children has passed the stage of demonstrating that separate factors exist, the effort now being devoted to systematic identification of measurable abilities. This study was designed to confirm some of the tentative abilities demonstrated in other studies and to extend the exploration into memory processes and…