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.