Before revision: Carroll regarded the broad abilities as different "flavors" of g. Development of the three-stratum theory The three-stratum theory is derived primarily from Spearman's (1927)Spearman, C. (1927), The abilities of man, London: MacMillan model of general intelligence and Horn & Cattell's (1966) theory of fluid and crystallized intelligence.
After revision: Carroll regarded the broad abilities as different "flavors" of g. Development of the three-stratum theory three-stratum theory is derived primarily from Spearman's (1927)Spearman, C. (1927), The abilities of man, London: MacMillan model of general intelligence and Horn & Cattell's (1966) theory of fluid and crystallized intelligence.