This essay provides a comprehensive overview of strategic development tools used in business, focusing on PESTEL analysis, SWOT analysis, and Porter's Five Forces model. It explains how these tools are applied to analyze external and internal environmental factors, using examples like Tesco, Audi, and Coca-Cola to illustrate their practical application. The essay details the components of each tool, such as political, economic, social, technological, environmental, and legal factors in PESTEL; strengths, weaknesses, opportunities, and threats in SWOT; and the threat of new entrants, substitutes, bargaining power of buyers and suppliers, and competitive rivalry in Porter's Five Forces. The conclusion emphasizes the importance of these analyses in developing effective strategies for achieving competitiveness and growth, making it a valuable resource for understanding strategic development.