THE DEVELOPMENT AND APPLIED UTILITY OF A NORMATIVE APTITUDE-ACHIEVEMENT TAXONOMY FOR THE WOODCOCK-JOHNSON-PSYCHOEDUCATIONAL-BATTERY-REVISED

This study developed a normative core profile taxonomy of the most com mon aptitude and achievement scales in the Woodcock-Johnson Psyche-Edu cational Battery-Revised (WJ-R; Woodcock & Johnson, 1989). Eight scale s were included in the analyses: the WJ-R's four scholastic aptitudes and their four corresponding achievement scales. Cluster analysis was used to sort 2,620 students from the standardization sample of the WJ- R. Results Of internal and external validity analyses provided support for eight core profiles. Both theoretical and practical implications are discussed in terms of how the ability and achievement scores covar y in the population. Practical implications and utility are gained by providing a multivariate procedure through which the distinctiveness o f a given child's aptitude-achievement profile can be assessed through comparison to the population core types.