The validity of the Personality Diagnostic Questionnaire-Revised (PDQ-R) was examined. The PDQ-R and the Crowne-Marlowe Social Desirability Scale (SD) were administered in the spring of 1989 to 45 undergraduates (26 females and 19 males) at Gettysburg College in Pennsylvania. One month later, the Hopkins Symptom Check List (SCL-90) was administered. Results support the validity of the PDQ-R in that 11 PDQ-R scales predicted subsequent SCL-90 scores. Results also indicate that PDQ-R validity may be problematic: four PDQ-R scales failed to predict subsequent psychopathology scores consistently, and several PDQ-R scales were correlated with either the SD or PDQ-R validity scales. One table displays correlations between the PDQ-R and the SCL-90. (Author/SLD)