The document contrasts the differences between startups and small businesses, and between the roles of founders and later-stage management. It discusses how startups search for a business model through customer development and pivoting, rather than following rigid business plans. The transition from startup to established company requires founders to transition to management roles and bring in professional executives. Business schools traditionally focus more on execution, accounting and management, while entrepreneurship schools emphasize customer development, metrics and hypothesis testing that are important for the startup search process.