This essay delves into the core concepts of organizational behavior, focusing on job satisfaction theory and Vroom's expectancy theory. It begins with an introduction to organizational behavior, highlighting its significance in understanding individual and group dynamics within organizations. The analysis then examines job satisfaction theory, exploring various models such as the "Range of Affect" theory, dispositional theory, and the core self-evaluations model, and how these theories explain the factors influencing employee satisfaction. Subsequently, the essay provides a critical analysis of Vroom's expectancy theory, discussing its components – expectancy, instrumentality, and valence – and evaluating its strengths and limitations in motivating employees. The relationship between job satisfaction and expectancy theory is explored, demonstrating how satisfied employees can facilitate the implementation of expectancy theory, and how the theory can be used to address employee dissatisfaction. The essay concludes by emphasizing the relevance of both concepts in contemporary business settings.