The Personality Assessment Inventory (PAI) provides information relevant for clinical diagnosis, treatment planning and screening for psychopathology. The PAI covers constructs most relevant to a broad-based assessment of mental disorders. It is comprised of 344 items and requires 50-60 minutes to administer. Each item is rated on a 4-point true/false scale. The PAI consists of 22 non-overlapping full scales including 4 validity scales, 11 clinical scales, 5 treatment scales, and 2 interpersonal scales. To facilitate interpretation and cover the full range of complex clinical constructs, 10 full scales contain conceptually derived subscales.