This chapter introduces organizational behavior and discusses its importance in the workplace. It defines organizational behavior as the study of how individuals, groups, and structure impact behavior within an organization. The chapter outlines the manager's key functions of planning, organizing, leading, and controlling. It also identifies the major contributing disciplines to organizational behavior as psychology, social psychology, sociology, and anthropology. Finally, it discusses the three levels of analysis in the book's OB model as individual, group, and organizational levels.