Date of Award


Document Type


Degree Name

Doctor of Psychology (PsyD)



First Advisor

David J. LaPorte, Ph.D.

Second Advisor

William Meil, Ph.D.

Third Advisor

William J. Farrell, Ph.D.


This study had three major objectives: (a) to investigate the construct validity of the Delis-Kaplan Executive Function System Sorting Test, (b) to investigate possible improvements to the construct validity by modifying administration instructions based on theoretical grounds, and (c) to explore utility of Sorting Test optional scores. Students in introductory psychology classes at a rural state university enrolled in the subject pool were sampled for this study (n=171). Participants ranged from 18-23 years old, were primarily freshman, and predominantly identified as White, non-Hispanic. Using this sample, the construct validity of the Sorting Test was not fully supported. Results were inconclusive regarding convergent validity; neither Confirmed Correct Sorts nor Free Sorting Description Score on the Sorting Test were significantly correlated with Categories Completed or Perseverative Responses on the Wisconsin Card Sorting Test (WCST), although Sort Recognition Description Score was significantly correlated with Categories Completed, r=.51, and Perseverative Responses, r=-.49 (all ps