Traditional approaches to intelligence have mainly evolved from Spearman’s theory of general intelligence, whichviews intelligence as general and fixed, and from applications of Binet’s approach, which views intelligence amongchildren and adolescents as normally increasing with age. The study of adult intellect and intellectual developmentindicates that neither approach well represents the depth and breadth of skills and knowledge that make up the adultintellectual repertoire. A framework for examining individual differences in intellectual development from adolescencethrough middle adulthood is discussed, along with a series of empirical investigations on the ability and non-ability (e.g.,personality, interests, self-concept) determinants of domain knowledge. Implications for understanding intelligenceduring adulthood and college-major choices are discussed from a perspective that combines intelligence as process,personality, and interests as they determine the development of intelligence as knowledge.
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