1998 James McKeen Cattell Fellow Award

John B. Carroll has made outstanding and sustained scientific contributions that have had a significant impact on several fields of applied psychology. These contributions spanned many areas, including psychological assessment, psychometric theory, and methodology, the study of individual differences and the nature and measurement of language aptitude and learning. His recent book, Human Cognitive Abilities, is a monumental integration of cognitive and aptitude theory. In connection with this work, he has reanalyzed over 460 data sets found in the factor analytic literature and integrated and interpreted these findings in the light of recent research in cognitive processing and cognitive ability measurement. This resulted in a new integrative theory of cognitive abilities that has many important applications