In developing his tests of intelligence,Alfred Binet assumed that the rate at which mental competence is gained is characteristic of the person and is fairly constant over time.

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Binet believed in the concept of mental age, where a child's level of intelligence is determined by their performance on a standardized test compared to other children of the same age. He assumed that mental age would increase at a relatively constant rate over time, hence the belief that mental competence is fairly constant over time.

In Developing His Tests of Intelligence,Alfred Binet Assumed That the Rate