The ability to use knowledge and problem-solving methods acquired through learning and experience to resolve a current problem. It has been argued that the Scholastic Aptitude Test assesses crystallised intelligence as do the verbal sub-tests of IQ batteries. Based on factor analysis, it was part of a theory of intelligence put forward by Raymond B. Cattell (1905-1998) in 1971 that separated the ‘g’ factor of Charles E. Spearman (1863-1945) into crystallised and fluid intelligence. As an addendum to his theory, Cattell also proposed what he called investment theory: how fluid intelligence might contribute to crystallised intelligence, but not the other way round.
See Cohort effect, ‘g‘, Factor analysis, Fluid intelligence, Folk wisdom, Flynn effect, Intelligence, Problem solving, Progress, Scholastic Aptitude Test (SAT)