Psychologist Louis L. Thurstone (1887-1955) first proposed in 1936 that there were primarily seven components of intelligence: Verbal Ability, Word Fluency, Spatial Intelligence, Perceptual Speed, Numerical Ability, Memory and Reasoning. There is a test for these known as the Primary Mental Abilities test.

PRIMARY ABILITIES: “Richard tested very high on his word fluency after taking the PMA.”
 Divorced Families and the Programs That Work for Them