This lecture introduces the Market Opportunity Navigator, a tool designed to help innovators and entrepreneurs identify and assess market opportunities. By complementing other business tools such as the Business Model Canvas and Lean Start-up Methodology, the Navigator guides users in strategically planning and adjusting their market entry strategies. It emphasizes the importance of a broad learning process and offers a macro view of opportunities, enhancing the micro-planning provided by the Canvases. The lecture highlights the synergy created by using these tools together, enabling a comprehensive approach to strategy development and validation. In week 5, the instructor will demonstrate how to effectively apply this suite of tools to set a successful market strategy.