This document provides an overview of organizational behavior (OB) concepts from the textbook "Organizational Behavior" by Robbins & Judge. It defines OB as the study of how individuals, groups, and structure impact behavior within organizations. The summary discusses key topics in OB including management functions and skills, Mintzberg's managerial roles, the challenges and opportunities in applying OB, and the contributing disciplines to OB like psychology, social psychology, sociology, and anthropology. It also introduces the three levels of analysis used in the book's OB model: individual, group, and organizational system.