In this project, we address the questions of whether and how monetary incentives and information measures can be combined to improve both the effectiveness and the public acceptability of environmental policies. The project has three work packages. Work p ackage one provide an overview of the literature on the effects on public acceptability and effectiveness of combined instrument use. In work package 2 we use experiments and empirical studies to analyze whether a combination of monetary incentives and in formation measures can increase the effectiveness of the instruments and the public acceptability of taxes. We will conduct an experiment where we test why individuals support earmarking of taxes. Further, we will conduct two field studies to examine the effectiveness of combining monetary incentives and information measures, one on solar panels and one on waste management. In work package three we consider the implications of our findings in the light of both the theory of policy instruments and environ mental policy in practice. We combine insights from economics and social psychology and results obtained in the project to form a basis for the development of a more comprehensive theory on policy instruments.The project brings together an experienced i nterdisciplinary research group, and builds networks between national and international research groups already involved in studying policy instruments from different perspectives. It includes a Ph.D. We plan to publish five papers from the project in i nternational peer reviewed journals, and we will also seek to disseminate results to users during the project period.