Abstract
The performance of a sample of moderately mentally retarded children on the McCarthy Scales of Children's Abilities (MSCA) was investigated by comparing their obtained mental age (MA) scores with their Stanford-Binet MAs and Minnesota Child Development Inventory (MCDI) developmental ages (DAs). All three MA estimates correlated significantly, and there were no significant differences among mean MAs. However, valid MSCA Index scores could not be obtained for these moderately retarded children, using the current normative tables. Therefore, the MSCA cannot be recommended for measuring the intellectual level of retarded children for educational classification purposes.
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