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WISC-R results of 1 069 subjects with moderate and mild mental retardation aged from 8 to 16;6 years were collected and analyzed to determine whether the degree of correlation between subtests is a function of the level of mental retardation. All subtests of the WISC-R were successively used to split the sample into two groups (low vs high score). Analyses revealed that the correlations between subtests and the variance explained by the first factor extracted from the correlation matrices were higher in the low score group, regardless of the subtest used to divide the sample. These results seem to confirm the law of diminishing returns and indicate that it is valid below the limits of normal variations. Several implications and limits of this study are discussed.
