This report analyzes the roles of leaders and the functions of managers within an organizational context. It explores various leadership theories and models, including the systematic leadership model, contingency leadership theory, and situational leadership theory. The report highlights the importance of adapting leadership styles to different situations, such as product planning, employee motivation, and decision-making processes. It also includes a case study of Marks & Spencer, examining how managers and leaders addressed challenges related to healthcare service delivery and employee productivity. The report emphasizes the significance of clear objectives, effective communication, and employee engagement in achieving organizational goals and minimizing disruptions. The application of different theories like Fiedler's theory for motivating personnel is also discussed. The report concludes by emphasizing the importance of a flexible and adaptive approach to leadership in the modern competitive market.