Charles Spearman believes that general intelligence cannot be measured directly but can be inferred from various abilities.

Charles Spearman

A British psychologist known for his work in statistics and intelligence, notably for his theory that human intelligence is largely governed by a general intelligence factor, g.

General Intelligence

A hypothesis positing a wide-ranging cognitive capability that impacts outcomes on tests of intellectual abilities.

Various Abilities

A term referring to the diverse range of skills or competences that different individuals possess.