The document provides an introduction to organizational behaviour. It defines organizational behaviour as a field of study that seeks to understand, predict, and influence individual behavior in organizational settings. It draws on various disciplines like psychology, sociology, social psychology, and anthropology. Key contributions of these disciplines to OB are discussed. The document also discusses the nature of OB as an interdisciplinary applied science with a humanistic approach oriented toward organizational objectives. Milestones in the history of OB like scientific management and the Hawthorne studies are summarized. Challenges and opportunities for applying OB like responding to economic pressures, globalization, and managing workforce diversity are outlined.