When developing the Binet Intelligence Test, it was assumed that mentally retarded children would perform like normal children of a younger age.

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This is the assumption made by Alfred Binet and his colleague Theodore Simon when developing the Binet Intelligence Test in the early 1900s. They believed that mentally retarded children would have intellectual abilities similar to those of younger children who were not mentally retarded. This assumption served as the basis for the test's age-graded scale, which was later revised and expanded in the United States to become the Stanford-Binet Intelligence Scale.

When Developing the Binet Intelligence Test, It Was Assumed That