The aim of this investigation was to provide an empirical basis for the interpretation of the WISC-R according to the Luria-Das model of simultaneous and successive processes. Using both an empirical and logical approach, those WISC-R subtests that were expected to involve simultaneous and successive processes were identified. Then the subtest intercorrelation matrices reported by Wechsler (1974) for normal children, Van Hagen and Kaufman (1975) for mentally retarded children, and Stedman, Lawlis, Cortner, and Achterberg (1978) for referred children were factor analyzed. Results of these analyses yielded support for interpreting the WISC-R in accordance with the Luria-Das model of simultaneous and successive processes.
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