David Lewis is Professor of Social Policy and Development in the Department of Social Policy, London School of Economics. He is the author of Bangladesh: Politics, Economy and Civil Society (2012) and co-editor of The Aid Effect (Pluto, 2005).David Mosse is Senior Lecturer in Social Anthropology at the School of Oriental and African Studies, University of London. He is author of The Rule of Water: Statecraft, Ecology and Collective Action in South India (Oxford University Press, 2003).