then success on the test represented the 8-year-old level of intelligence. From Binet's work, the phrase "intelligence quotient," or "IQ," entered the vocabulary. The IQ is the ratio of "mental ...

Intelligence Quotient (IQ) tests have long been the standard for measuring human intelligence. Developed in the early 20th ...

who developed the Binet-Simon scale to identify children needing special education. Over time, this test evolved into more sophisticated versions, including the Stanford-Binet test and later ...