This document discusses corporate-level strategy, which involves selecting different businesses and industries for a firm to compete in order to gain a competitive advantage. It defines diversification and different levels and types. Reasons for diversification include gaining market power, capturing synergies between business units, and financial motives. Related diversification seeks economies of scope while unrelated diversification pursues financial synergies. The document analyzes strategies of companies like P&G, J&J, Campbell Soup, United Technologies, and Textron. It also discusses portfolio analysis tools for evaluating a firm's mix of businesses.