"Despite its central importance for the implementation of EU social policy, the issue of member state enforcement of European regulations has attracted little academic attention. This paper analyses changes in national enforcement systems and horizontal cooperation between them by comparing labour inspectorates in the EU-15 member states over time (2000 versus 2010). Starting from the assumption that, as administrations, enforcement systems are strongholds of national sovereignty, it is argued that member states' interest in creating a level playing field and in enabling free movement in accordance with the ‘four freedoms' should nevertheless bring about change. The results show insufficient enforcement capacity overall, but also that important changes have taken place regarding the coordination, steering and pressure capacity of national labour inspectorates, and also regarding cooperation amongst them. This points to the emergence of horizontal cooperation as a distinct feature of the European Administrative Space."

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