This report offers a comprehensive analysis of organizational change management, focusing on the case of Marks & Spencer. It begins with an introduction to organizational change, highlighting its interdisciplinary nature and importance for business success. The report then compares Marks & Spencer with Zara, examining technological and structural changes, as well as their differing organizational approaches. It delves into the internal and external drivers of change, including employee morale, financial management, and innovation, and their impact on leadership, decision-making, and individual behaviors. The report also explores measures to minimize the negative impacts of change. Furthermore, the report discusses barriers to change and their effect on leadership decision-making. Finally, the report addresses the importance of innovation and the need for companies to adapt to stay competitive in today's rapidly changing world, providing a detailed overview of the key concepts and strategies involved in managing organizational change effectively.