Psychological behaviorism is a form of behaviorism – a major theory within psychology which holds that generally, human behaviors are learned. The theory is constructed to advance from basic animal learning principles to deal with all types of human behavior, including personality, culture, and human evolution. Behaviorism was first developed by John B. Watson (1912), who coined the term "behaviorism," and then B. F. Skinner who developed what is known as "radical behaviorism." Watson and Skinner rejected the idea that psychological data could be obtained through introspection or by an attempt to describe consciousness; all psychological data, in their view, was to be derived from the observation of outward behavior. The strategy of these behaviorists was that the animal learning principles should then be used to explain human behavior. Thus, their behaviorisms were based upon research with animals. Staats’ program takes the animal learning principles, in the form in which he presents them, to be basic. But, also on the basis of his study of human behaviors, adds human learning principles. These principles are unique, not evident in any other species. Holth also critically reviews psychological behaviorism as a "path to the grand reunification of psychology and behavior analysis".