Alfred Binet

Alfred Binet (1857–1911) was a French psychologist who pioneered practical intelligence testing and co-developed the Binet–Simon scale with Théodore Simon.

Théodore Simon: A French physician and psychologist who collaborated with Alfred Binet on an intelligence scale for children. Simon co-developed the scale that made Binet’s testing work practical.
Binet–Simon scale: A test developed by Alfred Binet and Théodore Simon to identify schoolchildren needing additional educational support. This was the instrument through which Binet put his assessment principles into practice.
Compulsory education in France: The expansion of legally required schooling in France, established through late nineteenth-century laws including the 1882 Ferry law. Compulsory schooling brought varied learning needs into classrooms and created demand for assessment.
Stanford–Binet Intelligence Scales: A family of intelligence tests developed from Lewis Terman’s revision of the Binet–Simon scale at Stanford University. Terman’s adaptation transformed Binet’s original scale into a widely used American test.
Lewis Terman: An American psychologist who revised the Binet–Simon scale into the Stanford–Binet Intelligence Scales. Terman’s revision carried Binet’s approach into American education and psychology.
Mental age: An estimate of the age level at which a person performs on tasks designed for different age groups. Binet compared a child’s test performance with typical performance at different ages.
French Third Republic: The republican regime that governed France from 1870 to 1940. Its public-school reforms provided the institutional setting for Binet’s work.
Intelligence quotient: A standardized score intended to summarize performance on tests of cognitive ability relative to a reference population. The familiar IQ formula was developed after Binet and was not his original measure.
Francis Galton: An English polymath who studied individual differences and attempted to measure human abilities through sensory tests. Galton’s sensory approach contrasts with Binet’s emphasis on complex mental tasks.
Individual differences: Stable or variable differences among people in abilities, behavior, personality, or other characteristics. Binet’s testing sought to characterize differences among children, not just average development.

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