The teaching note includes four board diagrams: Board Diagram #1: Ask students to generate a topical list of solutions to the market failure of water filters and PHW and discuss the pros and cons of each. . Board Diagram #2: Draw a supply chain model that can be developed for the PHW filter product. Identify the supply chain participants and the vulnerable spots and their causes. . Board Diagram #3: List the reasons why PHW should and should not consider building a filter manufacturing facility. . Board Diagram #4: Define and consider alternate pricing objectives and models