This report explores the intricate relationship between leadership and management within the context of operations management. Using Marks and Spencer (M&S) as a case study, it delves into the distinct roles and characteristics of leaders and managers, examining how these roles manifest in different situational contexts. The report analyzes various leadership theories, including situational leadership, systems leadership, and contingency theory, to understand how effective leadership and management contribute to achieving business objectives. It further investigates key approaches to operations management, such as Six Sigma, Total Quality Management, Lean Production, and Just In Time, highlighting the crucial role of leaders and managers in implementing these strategies. The report concludes by assessing the impact of external factors, such as global competition, technology, environmental concerns, and the growth of the service sector, on operational management and decision-making processes.