This article begins with a brief review of the current literature on the structure and measurement of perfectionism. It is concluded from this review that two major types can be distinguished, a normal/healthy form and a pathological form. These two forms are then defined as positive and negative perfectionism and related directly to Skinnerian concepts of positive and negative reinforcement. The positive/negative distinction is then further elaborated on in terms of approach/avoidance behavior, goal differences, self-concept involvement, emotional correlates, and the promoting environment. Finally, some of the more obvious theoretical and practical implications are briefly explored.