The dissertation project uses interpretive discourse analysis (Hajer 1995, 2005, 2008) to examine the political construction of critical infrastructures. The project analyses definitions, sectors and related discourses around ‘critical infrastructure’, using Sweden and Germany as case studies. The research focuses on the local level, particularly on urban areas that see themselves as ‘smart cities’. The discourses on critical infrastructures and smart cities have developed largely independently of each other. This project will link them together to address the question of criticality on a local level.