This project will firstly, identify best practices and, secondly, contribute to the effort to improve transnational cooperation on the enforcement of posted work. Moreover, it will bring important knowledge to the work of the European Labour Authority (ELA) in supporting national authorities when it comes to enforcement. Our consortium consists of Fafo and the Labour Inspectorates in Norway, Denmark, Iceland, Latvia, Estland, Lithuania and Finland. During our activities, we will also engage national social partners. Our method is a mix of document analysis, interviews and workshops. Through seminars, we will disseminate knowledge about the main objectives of this project.