Cattell elaborated on Spearman's "general factor" and on Thurstone's "primary mental abilities" by

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Cattell subdivided intelligence into two factors - fluid intelligence and crystallized intelligence. Fluid intelligence refers to the ability to reason and solve problems in novel situations, without relying on previously acquired knowledge. Crystallized intelligence, on the other hand, refers to acquired knowledge and skills through education and experience.

Cattell Elaborated on Spearman's "General Factor" and on Thurstone's "Primary