This document provides an overview of organizational behavior. It defines organizational behavior as the study of human behavior in organizational settings and how human behavior interacts with and influences the organization. The document traces the historical roots of organizational behavior from scientific management to the human relations movement. It describes key characteristics of contemporary organizational behavior, including its interdisciplinary nature and descriptive focus. Contextual perspectives on organizational behavior like the systems, contingency, and interactional perspectives are also discussed. The document outlines management functions, roles, and how organizational behavior can help managers understand complexity within organizations.