This paper builds on the guidance developed by OECD DAC supporting the effective evaluation of peacebuilding and conflict prevention programs, inputs from RPP consultations, an examination of actual evaluation practice and other sources. Its purpose is to promote deeper more meaningful discussions between peacebuilding evaluands, evaluators, donors and other evaluation users about impact evaluations and the distinctions between the effectiveness and impact criteria. It is not intended to be definitive or final, but rather an opportunity to deepen the discussion and practice of evaluation of peacebuilding work. The five core DAC evaluation criteria include relevance, effectiveness, efficiency, sustainability and impact. This paper focuses on impact evaluation.