Evaluating programs has become a fixture in the human service sector. In many cases, program staff are asked to conduct the evaluation without any training on how to properly do it. This widely used introduction to evaluation is intended for non-specialists who need to do evaluation as part of a busy workload. The book offers a practical overview of the main approaches to evaluation, strategies for involving stakeholders, and the evaluation industry's toolbox of models and techniques. The author emphasizes the core principles and concepts of evaluation, and provides extensive examples. This third edition reflects current thinking on values in organizations and the need to use evaluation to guide future practice. It is a handy reference for professionals and students in health, welfare, and community work, and in government and non-profit agencies.