Fluid-crystallized theory of intelligence

The fluid–crystallized theory of intelligence consists of several ability factors, most notably fluid intelligence (Gf) and crystallized intelligence (Gc). The theory is primarily concerned with providing a developmental framework for the structure of intelligence and with the assessment of adult intelligence. This entry describes the structure of the fluid–crystallized intelligence theory, the relationships between the factors, and the development and lifespan trajectories of Gf and Gc.