This volume reviews the evolution of ten years' learning and discovery about water scarcity, livelihoods, and food security within the CGIAR Challenge Program on Water and Food. It draws on the experiences of over 100 projects conducted in ten river basins in the developing world. "From a water scarcity and productivity programme to one of development challenges, this book presents the commendable work of the CPWF in very diverse basins all over the world. The processes implemented built on participation, innovation, dialogue and negotiation among the locals, ultimate users of the resource, will ensure the positive legacy of the programme. Since lessons learnt will stay with the locals, and will not leave with the donors, the initial expectations of research for development may even be surpassed. Certainly a lesson for many donors." - Cecilia Tortajada, President, Third World Centre for Water Management,Mexico.