Meta-Analysis of the Validation Studies of the Kaufman Assessment Battery for Children

A meta-analysis of the Kaufman Assessment Battery for Children (K-ABC) was conducted to ascertain the numbers of factors in the mental processing subtest of the K-ABC. After a summary and synthesis of the psychometric literature, a pooled correlation matrix was computed and a factor analysis applied. Two and 3-factor extraction (rotated by varimax) methods using principal axis factor analysis and principal component analysis consistently yielded 2 factors-namely, sequential and simultaneous processing. The results suggest that the original K-ABC theory was not supported.