This report provides a comprehensive analysis of management accounting principles and planning tools, with a specific focus on their application within Marks & Spencer (M&S). It begins by explaining the concept of management accounting and its essential requirements, including various management accounting systems such as cost accounting, inventory management, job order costing, and price optimization. The report then describes different methods used for management accounting reporting, such as performance reports, budget reports, and accounts receivable reports. Cost analysis techniques, including marginal and absorption costing, are applied to prepare an income statement. The advantages and disadvantages of planning tools for budgetary control are discussed, along with their role in addressing financial issues. The report also compares how organizations adapt management accounting systems to respond to financial problems, highlighting the integration between management accounting systems and reporting. The analysis demonstrates how M&S utilizes these principles and tools to manage its financial performance and respond to market challenges.