- In the early 1900s, the French government asked Alfred Binet and Théodore Simon to find a fair way to identify children who needed additional educational support.
- Rather than measuring sensory reactions like Galton, Binet used everyday reasoning tasks such as following instructions, defining words, and solving simple problems.
- Binet introduced mental age, the age level whose typical performance a child matches regardless of their actual age.
- Binet cautioned that his scale measured current performance, not innate or unchangeable ability, and he believed intelligence could grow with the right teaching.
Why was the Binet-Simon scale created?
In the early 1900s, the French government asked Alfred Binet and Théodore Simon to find a fair way to identify children who needed additional educational support. Their goal was practical and compassionate: to help struggling students, not to sort people by worth. The resulting Binet-Simon scale appeared in 1905.
How did the test work?
Rather than measuring sensory reactions like Galton, Binet used everyday reasoning tasks such as following instructions, defining words, and solving simple problems. Items were ordered by difficulty and matched to the ages at which typical children could pass them. This let an examiner estimate where a child stood relative to peers.
What is mental age?
Binet introduced mental age, the age level whose typical performance a child matches regardless of their actual age. A child who solved tasks that most eight-year-olds could solve had a mental age of eight. It was a flexible, descriptive snapshot, not a fixed verdict about a person's potential.
What did Binet himself warn about?
Binet cautioned that his scale measured current performance, not innate or unchangeable ability, and he believed intelligence could grow with the right teaching. He worried it might be misused to label children permanently. Later testers in other countries often ignored these warnings, turning his helpful tool into a ranking instrument.