Comparison of seven‐subtest and Satz‐Mogel short forms of the WAIS‐III

Intellectual functioning remains an important domain of functioning to be measured. To reduce the lengthy administration time, numerous short forms of the WAIS-III have been devised. The present study aimed to compare two methods of applying short forms of the WAIS-III within a clinical population. The results revealed that both item-reduced and selected subtest short forms provide excellent predictions of full administration WAIS-III summary and index scores. The Satz-Mogel short form appeared to provide higher predictive power than the seven-subtest short forms and accounted for a higher number of cases within 6 points of the obtained scores from the full administration. However, the Satz-Mogel short form was inferior to the seven-subtest short forms in terms of the reliability of the index and summary IQ scores. As found in previous research, a trade-off occurs between the predictive power and the reliability of a short form.