In 1904, Thurstone and Thurstone proposed the idea that intelligence is comprised of one overarching factor, which is responsible for performance on all mental tests.

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Thurstone proposed a theory of multiple intelligences, which suggested that intelligence was made up of seven separate factors. He later revised his theory and proposed that there may be a more general factor, but he did not believe that it explained all mental abilities.

In 1904, Thurstone and Thurstone Proposed the Idea That Intelligence