This report provides a comprehensive analysis of organizational behaviour, focusing on the case of Marks & Spencer (M&S). The introduction establishes the context of the study, highlighting the importance of organizational behaviour in managing resources and achieving organizational objectives within a multinational retail environment. The report explores how culture, politics, and power influence organizational behaviour at M&S, examining the impact of various cultural models (power, role, task, and person cultures) and the effects of organizational politics and different power dynamics (legitimate, reward, referent, and expert power) on employee motivation, turnover, and team performance. It then delves into motivation theories, differentiating between content and process theories. Specifically, the report examines Herzberg’s two-factor theory, McClelland’s human motivation theory, and Adam’s equity theory, discussing their advantages, disadvantages, and practical implications for M&S. The report concludes by discussing effective and ineffective teams, leadership styles, and the impact of organizational behaviour concepts and philosophies on employee behaviour, offering insights into how M&S can manage its workforce effectively and sustainably within the competitive retail sector. References and a conclusion are also included.