The Kaufman Assessment Battery for Children–Korean (K-ABC-K) was developed to assess the intelligence and achievement of preschool and school-aged Korean children. This study examined the validity of the Sequential Processing, Simultaneous Processing and Achievement scales of the K-ABC-K using the technique of principal factor analysis. The K-ABC-K is not just a simple translation, but an adaptation of the K-ABC for Korean children. The subjects of the study included 2,400 children from The K-ABC-K standardization sample, ranging in age from 2.5 to 12.5 years. Factor analysis of the ten Mental Processing and six Achievement subtests yielded three factors for ages 4 and above. As was true for the American K-ABC, only two factors emerged for ages 2.5 and 3. In general, the factor analyses provided strong support for the construct validity of the K-ABC-K and supported common underlying mental constructs for Korean and American children.

This study reviewed, integrated and interpreted the literature on Japanese intelligence that followed from Lynn's (1982) conclusion of an 11-point WISC-R IQ superiority of Japanese over American children and adolescents. Reanalyses of Lynn's data, as well as subsequent research, suggest that the supposed 11-point Japanese superiority is exaggerated. In addition, this study explored the hypothesis that Japanese children perform significantly better on simultaneous processing than on sequential processing. Regression equations derived from a sample of American children who were tested on both the WISC-R and K-ABC were applied to Lynn's data on Japanese children. Results of these analyses supported the hypothesis of a discrepancy, with Japanese Simultaneous processing being significantly greater than Sequential processing, relative to American children, across virtually the entire 6-to 16-year age range.

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