The international project STEP UP - “Stepping up the European cooperation and communication among Public & Private organizations for the protection of posted worker’s rights” is focused on the phenomenon of transnational posting of workers and aims to verify the application of recent European regulations in the field of labour migration, entrepreneurial behaviour and the concrete role played by inspection bodies. The idea of the project starts from the recent interventions of the European legislator in the field of transnational posting: interventions aimed at avoiding the low-cost posting of staff in the transnational field, with dangerous forms of competition for posted workers. At the conclusion of the research activities of the project carried out jointly by the Universities of Parma (IT), Vilnius (LT), Granada (ES), Porto (PT) and Bucharest (RO), a final international conference was organized for the presentation of the results. The Conference was held in Parma on 9 and 10 June 2022. Members of the academic environment, researchers in the STEP UP project, as well as agents of trade unions and labor inspectorates from different countries joined the discussions, sharing their practical experience, research results and learned lessons. In the essays collected in this volume, we invite you to briefly discover our research results, as well as the point of view of conference speakers regarding their take on the future of European legislation on transnational posting of workers.