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| WAIS‑III | WAIS‑IV | |----------|----------| | Verbal IQ & Performance IQ | Four index scores (VCI, PRI, WMI, PSI) | | Object Assembly subtest | Removed | | Picture Arrangement subtest | Removed | | Less emphasis on working memory | Expanded Digit Span (added sequencing) | | Lower ceiling for high ability | New items to reduce floor/ceiling effects |
The WAIS IV is a required instrument for diagnosing Intellectual Disability (ID) (typically FSIQ below 70-75 plus adaptive functioning deficits). Conversely, it helps identify giftedness for placement in advanced programs.
Neurologists use the WAIS-IV to localize brain dysfunction. For example:
Unlike earlier versions that emphasized Verbal and Performance IQs, the WAIS‑IV organizes subtests into , each tapping a distinct cognitive domain:
