This report provides a comprehensive analysis of strategic management principles, using Marks & Spencer (M&S) as a case study. It begins with an introduction to strategic management, defining its role in evaluating markets and resources to achieve organizational objectives. The main body delves into the processes organizations use to determine their strategy, emphasizing the importance of a clear vision and the steps involved, such as determining strategic position, prioritizing objectives, developing, executing, and reviewing plans. The report then evaluates critical models and tools, including SWOT and PESTEL analyses, to assess the impact of the internal and external environments on business performance. These tools are applied to M&S, examining its strengths, weaknesses, opportunities, and threats, as well as political, economic, social, technological, environmental, and legal factors affecting its operations. Finally, the report critically appraises the importance of change management, considering the complexities, costs, risks, and sustainability of transformation processes within the context of M&S's business operations.