In creating his intelligence test for children, Alfred Binet made the assumptions that mental abilities develop with age and that the rate at which mental competence is gained is relatively constant over time.

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Alfred Binet, in developing his intelligence test, indeed assumed that mental abilities develop with age and that the rate of this development is fairly constant across different individuals, which is why his test aimed to measure a child's mental age compared to their chronological age.

In Creating His Intelligence Test for Children, Alfred Binet Made