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Although the Binet test has proved its reliability as an instrument to measure the intellectual capacity of children of school age, psychometric tests for children of preschool age, particularly the Kuhlman modification of the Binet, have not been standardized on large enough numbers of such children to give them the same degree of reliability. Furthermore, the Binet test gives a fairly constant result when applied several times to the same child over a period of several years, but when preschool children have been retested by the Kuhlman modification, a wide variation has been found in the results. This may be due to defects in the test itself, or to an actual variation in the rate of mental growth in the preschool period.
The author has applied the Kuhlman modification of the Binet test to the largest group of children of preschool age yet tested. In all, 495 children selected so