Abstract
The joint factor structure of the Differential Abilities Scale (DAS) and the Wechsler Intelligence Scale for Children-Revised (WISC-R) was investigated. Principal components analysis with varimax rotation was conducted ( n = 115). A four-factor solution emerged, consisting of Verbal-conceptual, Visual-spatial, Attention-Quantitative, and Processing Speed Factors. The WISC-R Third Factor split apart, as Coding joined the DAS Speed of Information Processing subtest to form a fourth factor, Processing Speed. Overall, the analysis supported the DAS structure, and was also consistent with the WISC-III four-factor reinterpretation of the WISC-R.
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