School Psychology Review
The McCarthy Scales of Children's Abilities: Research Implications for the Assessment of Young Children
Richard J. Nagle
Services to Preschoolers and Children With Low Incidence Handicaps
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ABSTRACT: A review of the reliability and validity studies of the McCarthy Scales of children’s Abilities (MSCA) shows that the MSCA has excellent reliability and stability; however, its concurrent validity with conventional IQ tests suggest that the McCarthy GCI and IQ are not comparable. Suggestions for future research aimed at delimiting the factors which moderate the GCI-IQ discrepancy were forwarded. The use of the MSCA in the assessment of preschool children was also discussed.