The Wechsler Intelligence Scales are individually administered, standardized assessments of cognitive functioning. There are three Wechsler intelligence batteries, each designed for different age ranges: the Wechsler Preschool and Primary Scales of Intelligence (WPPSI), the Wechsler Intelligence Scales for Children (WISC), and the Wechsler Adult Intelligence Scales (WAIS). In 1939, the first test published by David Wechsler was intended for adults and was called the Wechsler–Bellevue. In 1955, the Wechsler–Bellevue became the first version of the WAIS. The first version of the WISC was developed in 1949, and the first version of the WPPSI was developed in 1967. With each revision of the Wechsler Scales, the subtests have been updated, new tests have been introduced, other tests have been removed, and changes have been made to ...
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