R. W. Kamphaus and C. R. Reynolds developed a scoring system for the Kaufman Assessment Battery for Children (K-ABC) in which test users derive alternative summary scores, including General Intelligence, Verbal Intelligence, and Reading composites. In this study, we evaluated the construct validity of this supplementary scoring model with data from a sample of referred school-age children and from the K-ABC normative sample. Within the referred sample, we conducted a factor analysis to determine the joint factor structure of subtests from the K-ABC and other IQ and achievement measures. We evaluated within the normative sample the relative fits of the factor models implied by the original and Kamphaus-Reynolds scoring models to subtest inter-correlations. Our results supported the construct validity of only part of the Kamphaus-Reynolds scoring model.
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