Water Supply and Sanitation Policy in Developing Countries Part 2 is our second MOOC in a two-part sequence, and looks at ‘Developing Effective Interventions’. Here we invite you to develop analytical skills and deep understanding about a complex, controversial policy problem – one with no simple, easy answers. About half a billion people on our planet still lack access to improved water supplies and about two billion do not have improved sanitation services, leading to an unknown but very large number of avoidable deaths each year from water-related diseases. Millions of dollars are spent on avoidable health care expenditures, and people – mostly women – spend many billions of hours carrying water from sources outside the home. Reducing these costs is a major global challenge for us all in the 21st century. Join us to explore the challenging and complex political, economic, social, and technical dimensions of the policy interventions that donors, national governments and water utilities use to address this challenge.