Following the publication in 1993 of the World Bank ' s policy paper on "" Water Resources Management, "" the World Bank Institute/Learning and Leadership Center initiated a training program on water policy reform, based on the principles outlined in the policy paper. A series of national, regional, and international seminars was organized to disseminate best practices in water resources management and to stimulate high-level policy dialogue on policy options in the water sector. Within the irrigation subsector, the WBI training program focused on policies that encourage participation of the irrigation users in managing the irrigation systems on which their livelihoods depend. While the basic principles of PIM (participatory irrigation management), outlined in chapter 1,seem intuitively sound and even obvious, there are surprisingly few cases in which PIM policies are adopted and fully implemented on a national level. This report comprises studies of situations where PIM seem to have worked. Case studies focus on Mexico, Turkey, Colombia, and the Philippines. These studies resulted from a collaboration between the WBI and the International Water Management Institute. They address the political antecedents of PIM polices, the process of implementing the policies, and the second-generation challenges of sustaining PIM.