 Even behaviorism (Skinner 1953) rejects the idea that the social is built out of internal psychological states. Instead, it argues that only externally observable human behaviors can be the basis of a scientific inquiry into the psychological and social sciences. Still, behaviorism resembles psychologism more than it departs from it: it replaces the internal states of minds with the “outputs” of the mind in behavior, and takes the social to be exhaustively determined by those outputs or behaviors (see entry on  behaviorism).