Each question describes a behavioral pattern that is consistent with a symptom of a personality disorder.
Patients can answer questions using the keybaord or the mouse.
Results are saved as text files and can be displayed graphically and saved in .pcx. Each testing session takes 15-20 min and does not require direct supervision of the patient. For diagnostic purposes, the text output from the PDQ-4 testing session can be quickly reviewed with the patient to confirm diagnosis. The PDQ-4 is a DOS based program.