"The DAC Working Party on Aid Evaluation (WP-EV) has developed this glossary of key terms in evaluation and results-based management because of the need to clarify concepts and to reduce the terminological confusion frequently encountered in these areas. Evaluation is a field where development partners – often with widely differing linguistic backgrounds – work together and need to use a common vocabulary. Over the years, however, definitions evolved in such a way that they bristled with faux amis, ambivalence and ambiguity. It had become urgent to clarify and refine the language employed and to give it a harmonious, common basis. With this publication, the WP-EV hopes to facilitate and improve dialogue and understanding among all those who are involved in development activities and their evaluation, whether in partner countries, development agencies and banks, or non-governmental organisations. It should serve as a valuable reference guide in evaluation training and in practical development work." (Foreword)