Expectations are high regarding the potential benefits of public–private partnerships (PPPs) for infrastructure development in poor countries. The development community, led by the G20, the United Nations, and others, expects PPPs to help with “transformational” megaprojects as well as efforts to achieve the Sustainable Development Goals (SDGs). But PPPs have been widely used only since the 1990s. The discussion of PPPs is still dominated by best-practice guidance, academic studies that focus on developed countries, or ideological criticism. Meanwhile, practitioners have quietly accumulated a large body of empirical evidence on PPP performance. The purpose of this book is to summarize and consolidate what this critical mass of evidence-based research says about PPPs in low-income countries (LICs) and thereby develop a more realistic perspective on the practical value of these mechanisms. The focus of the book is on Sub-Saharan Africa (SSA), home to most of the world’s poorest countries, although insights from other regions and more affluent developing countries are also included. Case studies of many of the best-known PPPs in Africa are used to illustrate these findings. This book demonstrates that PPPs have not met expectations in poor countries, and are only sustainable if many of the original defining characteristics of PPPs are changed. PPPs do have a small but meaningful role to play, but only if expectations remain modest and projects are subject to transparent evaluation and competition. Experiments with PPP mechanisms underway in some countries suggest ways in which PPPs may be evolving to better realize benefits in poor countries.