Firms must adapt their strategies to compete in the 21st century landscape by bringing products to market faster, using new technologies, diversifying product lines, shifting product emphasis, consolidating, and combining online and physical sales. Successful strategies include Dell's model of having a new business model every 5 years by identifying core competencies and improving four capabilities while outsourcing non-core work. Corporate strategy determines what businesses a company is in and what it wants to do with those businesses, managing business units and making the whole greater than the sum of parts through external and internal growth, resource allocation, and corporate development strategies like market penetration, product development, and diversification.