Certified Rehabilitation Counselor Practice

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Who developed the first reliable and valid battery of tests to measure intelligence?

Cattell
Wechsler
Raven
Spearman

The correct answer is: Wechsler

The development of the first reliable and valid battery of tests to measure intelligence is attributed to Wechsler. Wechsler introduced a series of intelligence tests, with the most notable being the Wechsler Adult Intelligence Scale (WAIS) and the Wechsler Intelligence Scale for Children (WISC). These tests were designed to assess multiple aspects of intelligence, moving away from the singular focus of earlier IQ tests, such as those developed by Binet or Stanford-Binet. Wechsler's approach included verbal and performance (non-verbal) scales, enabling a more comprehensive evaluation of an individual's cognitive abilities. This dual scale approach contributed to the reliability and validity of the tests, making them widely accepted in both clinical and educational settings. By incorporating various subtests that measure different cognitive skills, Wechsler’s tests address the multifaceted nature of intelligence, providing insights into a person's strengths and weaknesses. This innovation paved the way for advanced psychological assessments and remains influential in the field of psychology today.