Those who study global poverty and ways to reduce it face a perennial set of questions: Do advances in knowledge, research, and technology make a real difference in the lives of poor people? What effect does research have on the poor? Who benefits? The contributors to Agricultural Research, Livelihoods, and Poverty shed light on these questions through a collection of case studies that explore the types of impact that agricultural research has had on livelihoods and poverty in low-income countries.