ABSTRACT
Human behaviour is learned; precisely that behaviour which is widely felt to characterize man as a rational being, or as a member of a particular nation or social classais acquired rather than innate. To understand thoroughly any item of human behaviour—either in the social group or in the individual life—one must know the psychological principles involved in its learning and the social conditions under which this learning took place. It is not enough to know either principles or conditions of learning; in order to predict behaviour both must be known. The field of psychology describes learning principles, while the various social science disciplines describe the conditions.
