What transforms a desirable project on a government wish list to an attractive investment opportunity in the eyes of a potential private sector partner? This guide seeks to enhance the chances of developing effective partnerships between the public and the private sectors by addressing one of the main obstacles to the effective delivery of public-private partnership (PPP) projects: having the right information on the right project for the right partners at the right time. Data from the World Bank and the Public-Private Infrastructure Advisory Facility (PPIAF) private participation in infrastructure (PPI) project database indicate that private sector investment in infrastructure in developing economies grew steadily over the past decade. By 2007 the levels had finally surpassed the peak levels seen in 1997, the end of the previous growth spurt. This guide focuses specifically on what should be done, and when, in order to prepare projects to attract the right long-term private partners, procure their involvement, and manage the partnership. This guide is not a detailed project preparation manual; rather, it seeks to provide an overview of the process and what is involved so that greater realism can be applied to this challenging task and adequate resource plans can be developed.