Source: Robbins & Judge, 15e, 2013, p. 13 Organizational behavior is an applied behavioral science built on contributions from a number of behavioral disciplines, mainly psychology and social psychology, sociology, and anthropology. Psychology’s contributions have been mainly at the individual or micro level of analysis, while the other disciplines have contributed to our understanding of macro concepts such as group processes and organization. Exhibit 1-3 is an overview of the major contributions to the study of organizational behavior ( Robbins & Judge, 15e, 2013, pp. 13-14) . Psychology Psychology seeks to measure, explain, and sometimes change the behavior of humans and other animals. Those who have contributed and continue to add to the knowledge of OB are learning theorists, personality theorists, counselling psychologists, and, most important, industrial and organizational psychologists. Early industrial/organizational psychologists studied