The task of this study is to examine concepts, which can be used when evaluating environmental policies. The main aims of this study can be summarised in two questions: Should environmental policies be evaluated? and if so How could they be evaluated? The study is thus about examining evaluation approaches, methods and criteria in an area where the evaluation demands are high, while concepts and practices lack any degree of standardization. The underlying idea is to combine knowledge accumulated in the general evaluation field with knowledge on environmental issues and policies and to test the derived concepts in practice.