This presentation provides an analysis of Porter’s Five Forces model in the context of Marks and Spencer (M&S). It evaluates the competitive environment that could impact business functions and market position of M&S. The five factors of Porter’s Five Forces, namely, Threat of New Entrants, Threat of Substitute Products, Bargaining Power of Suppliers, Bargaining Power of Customers, and Rivalry among existing competitors are discussed in detail. The presentation concludes that Porter’s Five Forces is a useful technique for organisations to determine the competitive environment in which they are operating their business.