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The WAIS-IV is administered and scored by a professional who has been trained in test protocol and interpretation. The test takes approximately one hour to 90 minutes, and has 10 core subtests which make up four index scores, VCI, PRI, WMI and PSI. The VCI is a measure of verbal concept formation, verbal reasoning, and knowledge acquired from one’s environment. The PRI is a measure of perceptual and fluid reasoning, spatial processing, and visual-motor integration. The WMI is a measure of working memory abilities, which involve attention, concentration, mental control and reasoning. The PSI is composed of subtests measuring the speed of mental and eye/hand coordination. The PSI provides a measure of the child’s ability to quickly and correctly scan, sequence, or discriminate simple visual information. This composite also measures short-term memory, attention, and visual-motor coordination. The WAIS-IV uses standard scores (M = 100, SD = 15) for the VCI, PRI, WMI, PSI, GAI, Cognitive Proficiency Index (CPI) and FSIQ, and scaled scores (M = 10, SD = 3) for the 15 subtests (Sattler & Ryan, 2009).
The five supplemental tests in WAIS-IV (Comprehension, Picture Completion, Figure Weights, Letter-Number Sequencing and Cancellation) is carried out to either provide additional clinical
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The Administration and Scoring Manual and Technical and Interpretive Manual are clear and useful and much thought and preparation have gone into the revision. The WAIS-IV will likely serve as valuable instrument for assessing adolescent and adult intelligence for the next decade or more. However, research is needed to evaluate how this revision affects the classification of individuals, particularly those who are intellectually gifted or who have learning disabilities, psychiatric or neurological disorders, or intellectual

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