European societies are becoming ethnically and culturally more diverse, yet their health systems are failing to keep pace. The COST Action IS1103 ‘Adapting European health systems to diversity’ (ADAPT) aims to promote the adoption and implementation of policies responding to this increased diversity. It builds on the achievements of COST Action IS0603 ‘Health and Social Care for Migrants and Ethnic Minorities’ (HOME), which reviewed health inequalities among migrants and ethnic minorities as well as the measures designed to remedy them. ADAPT will take this work forward, identifying obstacles to translating this knowledge into action as well as ‘levers for change’. Despite a remarkable increase in research and innovation in this area, as well as significant backing from international bodies, the pace of change in Europe remains slow. Few countries have adopted national policies on migrant and ethnic minority health and even where they have, implementation has encountered many obstacles. ADAPT will make practical recommendations for promoting change. Interdisciplinary teams will identify bottlenecks and missed opportunities, while the pan-European nature of COST will provide a unique opportunity to identify the factors driving policy and implementation. The results will have implications for effective policy making and organisational change, not only in health but also in other fields of public policy. With the support of the Swiss State Secretariat for Education and Research (SER), USI has joined the ADAPT Management Committee. Contributions will be especially provided to the Working Group (WG) 1 ‘Policies and practices concerning MEM health in Europe and analysis of their sources of variation’ and also to the WG 3 ‘Health Services for Undocumented Migrants’.