This document provides an overview of organizational behavior including its definition, origin, theoretical frameworks, and importance for managers. Organizational behavior is defined as the study of human behavior in organizational contexts with the goal of improving organizational effectiveness. The origins of OB began with the famous Hawthorne studies from the 1920s. There are three main theoretical frameworks in OB: the behaviorist framework, cognitive framework, and social learning framework. The behaviorist framework includes classical and operant conditioning. The cognitive framework focuses on human thought processes like expectations and intentions. And the social learning framework emphasizes reciprocal interactions among cognitive, behavioral, and environmental factors. Understanding OB provides managers with tools and theories to analyze and improve employee behavior for better organizational performance.