Presentation by David Mair, Head of Unit, Knowledge Management, DG JRC, European Commission, at the event on Governing better through evidence-informed policy making, 26-27 June 2017. The event was organised by the OECD Directorate for Public Governance in cooperation with the European Commission’s Joint Research Centre (JRC), the Campbell Collaboration and the International Network for Government Science Advice (INGSA). For further information please see http://www.oecd.org/gov/evidence-informed-policy-making.htm