The European Commission decided after consultation with the Member States experts, interest groups and CEN, that there was an urgent need for standards to support the EPBD. A mandate was given to CEN (Mandate 343) to develop a set of standards. This set pf standards is based on a list of about 40 topics covering calculation, measurement and inspection procedures, including methods on the level of building components and systems. During 2007, a set of standards for the basis of national procedures in the Member States will be published. In particular the Member States with a very limited experience in the field of the EPBD could benefit from this in the short term. In addition, it will also increase the accessibility, transparency and objectivity of the energy performance assessment in the Member States in general. An overview of the CEN related activities is given in information papers P02 and P40, andrelated more recent papers.