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Developed by David Wechsler, the Wechsler intelligence scales became some of the most extensively used tests in psychology's history. The original version, the Wechsler-Bellevue Intelligence Scale, was created by combining subtests from earlier assessments to evaluate both verbal and nonverbal abilities. Although later renamed the Wechsler Adult Intelligence Scale (WAIS) and revised multiple times, the core aims of the test have remained largely the same since its inception.

Wechsler Intelligence Scales

The intelligence tests developed by David Wechsler have been updated over time and are now categorized into three main versions used today: the Wechsler Adult Intelligence Scale-fourth edition (WAIS-IV) for adults, the Wechsler Intelligence Scale for Children (WISC-V) for school-aged children, and the Wechsler Preschool and Primary Scale of Intelligence—IV (WPPSI-IV) for young children.

Classification of Modern Wechsler Tests

To maintain their accuracy and relevance, widely used intelligence tests like the Wechsler scales undergo periodic recalibration. This process involves re-norming and re-standardizing the test by administering it to large, contemporary populations. For example, the WISC-V was given to thousands of children across the U.S. so that current test-takers' scores can be compared against an up-to-date, same-age peer group.

Recalibration of Intelligence Tests

Which of the following best analyzes the primary reason David Wechsler's intelligence scales represented a significant advancement in psychological testing and became widely adopted?

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