This report provides an in-depth analysis of change management strategies at Tesco, a multinational grocery retailer. It compares the consequences of strategic changes with those at Marks and Spencer, examining technological and structural changes. The report assesses the impact of internal and external factors, including organizational culture, PESTEL factors (Political, Economic, Social, Technological, Environmental, and Legal), and proposes options like the PDCA cycle and Lewin's three-step model to mitigate negative consequences. It identifies barriers to change implementation, such as resource reallocation and employee resistance, using Force Field analysis to understand driving and restraining forces. Furthermore, the report explores various leadership approaches, including autocratic, democratic, transformational, bureaucratic, and strategic leadership, evaluating their suitability for Tesco's context. The conclusion emphasizes the importance of organizational change in the modern marketplace and highlights the role of top managers in achieving sustainability.