These stratification variables were chosen based on U.S. The sample was stratified on specific demographic variables including age, self-reported (ages 20–90) or parent-reported (ages 16–19) education level, ethnicity, and geographic region. The standardization sample of the WAIS-IV consists of 2200 examinees aged 16:0 to 90:11. This revision also sought to enhance psychometric properties, boost clinical utility, increase developmental appropriateness, and make the measure more user-friendly (Wechsler 2008b). While the general structure and many of the subtests remain consistent with previous editions, the WAIS-IV brought about an update to the theoretical foundation of the scales through the development of additional indices measuring cognitive domains beyond Verbal IQ and Performance l IQ. The measure has been shown to have significant utility among diverse populations in a variety of settings (Groth-Marnat and Wright 2016). The WAIS-IV is the fourth revision of the WAIS. From these two measures, Wechsler would go on to publish the WAIS in 1955 and the WAIS-Revised (WAIS-R) in 1981 just before his death (Boake 2002). He published the Wechsler-Bellevue Scale in 1939 and the Wechsler-Bellevue Form II in 1946. Having worked closely with many influential psychologists and researchers in the areas of intelligence and assessment, Wechsler developed his first scale of adult intelligence. When he was hired as the Chief Psychologist at Bellevue Psychiatric Hospital in 1932, Wechsler was confronted with the need for a suitable measure of adult intelligence. The history of the WAIS-IV can be traced back to the early work of the test’s namesake, David Wechsler.
The Wechsler Adult Intelligence Scale – Fourth Edition (WAIS-IV) is the most frequently used measure of adult intelligence today (Groth-Marnat and Wright 2016).
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