The Green Week Conference 2011 will be held in Brussels from May 24 to May 27 with this year's theme: Resource Efficiency - Using less, living better. Improving resource efficiency is a flagship initiative of the European Commission and is a core topic of DG Environment. A number of policy initiatives are expected to establish and to implement effective policies for a more efficient use of the different natural resources. LIAISE prepares to provide models and knowledge to support the assessment of such policies. For example, opportunities are sought to improve the geographical resolution of models for the assessment of water policies. Other groups are discussing environment-economic models to analyse the flow of materials from the extraction to the final consumption and deposition. What is the most effective and the most efficient point to intervene in these often global value chains? Which measures are possible within Europe to take into account the different scarcities of resources and what are adequate measures which can be taken on a European level? The LIAISE consortium explores which models would be available to cover the many different questions and how the existing models can be improved and combined to contribute to the expected Impact Assessments.