Which outcome is an important legacy left by Alfred Binet’s work on intelligence testing?

One of the most significant legacies left by Alfred Binet's work on intelligence testing is the concept of the Intelligence Quotient, or IQ.

1. Binet's Development of Intelligence Testing: Alfred Binet, a French psychologist, was commissioned in the early 20th century to develop a method for identifying students who might require more assistance in school. This led to the creation of the first practical intelligence test, known as the Binet-Simon scale.

2. Introduction of Mental Age: Binet introduced the concept of "mental age," which refers to the level of intellectual development relative to a person's chronological age. For example, a child with a mental age of 10, but a chronological age of 8, would be considered advanced.

3. Creation of IQ: Later, German psychologist William Stern proposed the Intelligence Quotient (IQ), which is a score derived from one of several standardized tests designed to assess human intelligence. The IQ is calculated as the mental age divided by the chronological age, times 100. This concept was based on Binet's work.

4. Legacy: Today, variations of Binet's original intelligence test are still widely used in many areas, including education and psychology. His work has significantly influenced our understanding of human intelligence, and the concept of IQ has become a central part of psychological testing.