The Handbook succeeds in capturing and presenting evaluation's extensive knowledge base within a global context. In so doing it provides a useful, coherent and definitive benchmark on the field's diverse and dynamic purposes, practices, theories, approaches, issues, and challenges for the 21st century. The Handbook is an essential reference and map for any serious evaluation practitioner, scholar and student anywhere in the world' - Michael Quinn Patton, author of Utilization-Focused Evaluation