The document discusses tools for performing an external audit of the strategic environment. It describes conducting an environmental scan and industry analysis to identify opportunities and threats beyond a firm's control, such as demographic trends, competition, and technological changes. A key framework is Michael Porter's Five Forces model, which examines the competitive rivalry in an industry and the bargaining power of suppliers, consumers, and substitutes. Firms can use tools like the External Factor Evaluation matrix to analyze various external factors and their impact on strategy.