The development of thought processes, including remembering, problem solving, and decision-making, from childhood through adolescence to adulthood.

Historically, the cognitive development of children has been studied in a variety of ways. The oldest is through intelligence tests, such as the widely used Stanford Binet Intelligence Quotient, or IQ, test first adopted for use in the United States by psychologist Lewis Terman (1877-1956) in 1916 from a French model pioneered in 1905. IQ scoring is based on the concept of "mental age," according to which the scores of a child of average intelligence match his or her age, while a gifted child's performance is comparable...