  In this entry I consider different types of behaviorism. I outline reasons for and against being a behaviorist. I consider contributions of behaviorism to the study of behavior. Special attention is given to the so-called “radical behaviorism” of B. F. Skinner (1904–90). Skinner is given special (not exclusive) attention because he is the behaviorist who has received the most attention from philosophers, fellow scientists and the public at large. General lessons can also be learned from Skinner about the conduct of behavioral science in general.  The entry describes those lessons.  