What is all the Hubbub About Having a Hub? Convening Organizations: Conrad N. Hilton Foundation, IRC WASH, Millennium Water Alliance, Sustainable WASH Systems Program including Mortenson Center in Global Engineering, Environmental Incentives and Tetra Tech Collective action (CA) approaches, often inclusive of a hub, bring together sector actors to work cohesively under a shared vision on complex challenges. CA seems to increase impact and sustainability, however research is ongoing. This session will discuss CA approaches, recent research, and the roles and design considerations of hubs.