The project Strengthening and widening the Europan infrastructure for social science data archives (CESSDA SaW) aims to achieve full European coverage, to strengthen the CESSDA network and to ensure sustainability of its data for the widened network. The primary ambition is to establish the conditions for, and initiate the movement towards, a seamless social science data archive service for the whole of the European Research Area, which is capable of supporting the research needs of the next generation of social scientists wherever in Europe they may be, or beyond. The overarching impact of the project will be to initiate the transformation of the user experience of social science data in the ERA, resulting in a transformation of the evidence and insight available to those tackling the social and economic issues of Europe.