This is the Swedish strategy and action plan for the National Competence Center for Social Innovation (CCSI). The strategy was developed within the project Building Capacity for a Sustainable Society (BuiCaSuS), one of six European Union (EU) consortia collaborating 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 wide range of backgrounds, from government ministries to NGOs.