This Handbook explains evaluation principles, concepts and technical aspects comprehensively and in simple terms. It will benefit a vast range of users including academics, evaluation practitioners, development professionals, development organisations and many others. It will be a useful resource in advocating for evaluation, designing evaluations and enhancing capacity on evaluation. -- Asela Kalugagampitiya, University of Sri Jayewardenepura, Sri Lanka This is an important Handbook that comprehensively lays out the foundational institutional and methodological issues and approaches in evaluation. It is written in a pragmatic style and is particularly helpful to young and emerging evaluators as well as other evaluation stakeholders. More experienced evaluators will find in many parts of the Handbook useful sections to refresh their knowledge. -- Jos Vaessen, The World Bank Evaluation is a crucial aspect of modern project and program work, particularly in the public sector, be it for planning, implementation, justification or control. This Handbook provides the necessary basics in a comprehensive and accessible manner, making it an indispensable resource for anyone working in the field of evaluation. -- Fritz Sager, University of Bern, Switzerland