Development in so-called ‘fragile states’ has become a key priority for the international community over the past few years, but international actors have not yet adequately incorporated sufficiently nuanced understandings of fragility into policies or practices. The increasing proportion of the world’s poor living in fragile contexts, the depth of human need in these contexts, and the potential regional spillover implications of this fragility, all make this an urgent concern. This chapter examines this growing need and discusses the origins and methodological approach in this volume, before setting up the rest of the book with definitions and an analysis framework. The chapter concludes with a summary of the book chapters and contributions.