The Commission's Better Regulation Guidelines take a holistic approach to the quantification of impacts of the various policy initiatives envisaged. Commission Impact Assessments are required to assess quantitatively (whenever possible) all relevant regulatory costs and benefits, both direct and indirect. As an independent body of the Commission, the Regulatory Scrutiny Board (RSB) noted in its 2016 Annual Report inadequate quantification of new regulatory initiatives. The Board announced a more demanding scrutiny in this area and made quantification of costs and benefits one of its priorities in 2017. Together with the Commission's Secretariat General (SG), the RSB developed a standard quantification table, which simplifies and systematizes how costs and benefits should be presented. In parallel, a Joint Working Group on Quantification, involving also the SG and the Commission's Joint Research Center (JRC), was set up in order to analyze possible information deficits on data sources and to assess possible methodological knowledge gaps. The Report of the RSB/SG/JRC Working Group draws on the findings of the RSB's scrutiny and evaluation of legislative initiatives (notably in 2017), as well as on inputs from the JRC on methodological and quantification aspects of a selected number of impact assessments and evaluations scrutinised by the Board in 2016. It makes available a large sample of costs/benefits quantification tables for the preferred options of these 2016-17 initiatives.