Intelligence quotient

Tests designed to measure the ability of the human mind to think and reason were created, leading to the development of the concept of intelligence quotient (IQ). The IQ represents the ratio of mental age to chronological age, and Binet's work laid the foundation for various psychological assessments.
 Alfred Binet France 1905 Intelligence quotient

Tests designed to measure the ability of the human mind to think and reason were created, leading to the development of the concept of intelligence quotient (IQ). The IQ represents the ratio of mental age to chronological age, and Binet's work laid the foundation for various psychological assessments.