Personality psychologists have recently concluded that 5 major dimensions account for most individual differences in personality traits. These dimensions are Neuroticism (N), Extraversion (E), Openness to experience (O), Agreeableness, and Conscientiousness. The NEO Personality Inventory (NEO-PI) is a concise measure of this 5-factor model and of some of the important traits that define the factors. Characteristics of the test, features for administration and scoring, and studies of reliability, stability, and validity are summarized. The NEO-PI may be particularly appropriate for use in counseling because it is brief, nonpsychopathological in content, and sensitive to client strengths as well as weaknesses.