As an applied research practice, policy evaluation has borrowed a range of methods from the social sciences. But its growth has also led to the development of specific approaches. Based on this observation, two fundamental choices guide this book: combining tools from fundamental research with others developed in evaluation practice, and opening a dialogue between quantitative and qualitative methods. Twenty-four qualitative, quantitative or mixed methods or approaches are thus presented in a didactic and illustrated manner, based on a common series of questions that facilitate their comparison.Thanks to its accessibility, this book is both a tool for interdisciplinary and inter-methods dialogue for academics, and a useful introduction for students, practitioners, policymakers and civil society.