The book introduces students to the main tools for evaluating projects and policies, combining qualitative insights with rigorous quantitative methods. It explains both prospective (ex-ante) and retrospective (ex-post) evaluations, from cost-benefit analysis to advanced econometric techniques. Readers will learn how to identify costs and benefits, apply discounting, and use decision rules for policy choices. They will also explore causal inference methods, including instrumental variables, regression discontinuity, and difference-in-differences. Case studies are drawn from transport, regional development, health, and environmental policies. European Commission evaluation practices are used as a reference framework throughout. By the end, students will be able to critically assess the design and impact of policies. The book is enriched with multimedia case studies to improve student engagement and interaction.