Usually, some evaluation measures are sketched out during the planning and design phase of a project. The evaluation plan allows a more detailed presentation of these measures. An evaluation plan is particularly helpful, and recommended, if a large evaluation is envisaged and if many questions regarding evaluation are left open in the project design. If an external organization is to be entrusted with the evaluation, an evaluation plan is compulsory – as a basis for discussion and for quotes. Pondering evaluation questions is helpful for clarifying one’s own expectations and for developing new and interesting lines of thought. Even if one is unfamiliar with evaluation, it makes sense to start thinking about possible evaluation methods. External evaluation experts can help to choose the best methodology for obtaining answers to the evaluation questions.