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The 1905 Binet–Simon Scale of Intelligence

Binet and Simon offered the Binet–Simon scale of intelligence as a valid way of distinguishing between normal children and children with mental deficiencies—a way that was to replace the less reliable physical, social, and educational signs being used at the time to identify children with mental retardation. The 1905 scale consisted of 30 tests ranging in difficulty from simple eye movements to abstract definitions. Three of the tests measured motor development, and the other 27 were designed to measure cognitive abilities. The tests were arranged in order of difficulty so that the more tests a child passed, the more fully developed his or her intelligence was assumed to be. The scale was given to normal children and to children thought to have retardation, all of them between the ages of 2 and 12.

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Binet and Simon found that almost all normal children aged 2 years or older could easily pass tests 1 through 6. Also, children with slight or moderate retardation could pass some or all of these tests. Children with severe retardation could pass only a few of them. Most of tests 7 through 15 could be passed by normal children between the ages of 2 and 5. Children with slight retardation could pass several of these tests, children with moderate retardation had great difficulty, and children with severe retardation could rarely pass any of them. Tests 16 through 30 could be routinely passed by normal children between the ages of 5 and 12, but children with even slight retardation had great difficulty with them, and children with moderate and severe retardation usually could pass none.

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