[en] The title project aims at increasing the knowledge about the possible application of these policy instruments. This knowledge should be suitable for the design of future policy instruments within the framework of climate policy. One of the results of the project should be a further improvement of models for evaluating of policy instruments. We hereby focus on the newer types of policy instruments. The key research issues considered in this project are: optimum design of policy instruments; effectiveness (how much energy is saved); efficiency (cost-benefit ratio; for the government; for the regulated parties; for society). In the analysis the following three stages of application of policy instruments are distinguished: policy formulation (e.g. by national governments); policy implementation (e.g. by regulatory agencies); policy impact (actual effect in firms). In this paper an overview is given of the results of the project 'Policy instruments for energy efficiency improvement' up to now. 13 refs