This is the Swedish strategy and action plan for the national Competence Center for Social Innovation (CCSI). The strategy is developed in the project Building Capacity for a Sustainable Society (BuiCaSuS), one of six European Union (EU) consortia cooperating to strengthen competence centers and ecosystems for social innovation in EU member states, in relation to the new programming period of the European Social Fund (ESF). BuiCaSuS includes partners from Spain, Latvia, France and Sweden with a very diverse profile, from ministries to NGOs.