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The Wechsler Intelligence Scale for Children-Third Edition (WISC-III) provides a Full Scale Intelligence Quotient (FSIQ), four factor standard scores, and subtest scale scores. Although the incremental validity of the WISC-III factor scores over FSIQ in predicting academic achievement has been questioned, this finding was based on the assumption that FSIQ should be entered first into the regression equation and failed to examine the shared variance among predictors. In contrast with previous findings, this study of 174 children meeting criteria for learning disabilities revealed that the WISC-III factors accounted for a large portion of achievement variance during hierarchical regression analyses, yet FSIQ added little predictive power. A commonality analysis of FSIQ indicated that it is largely comprised of unique, not shared, factor variance. Analyzing the WISC-III subtests from a Gf-Gc theoretical framework, academic …