Despite the polarization in public and policy debates generated by the post-2014 fluxes of refugees, asylum applicants and migrants, European countries need to work out an evidence-based way to deal with migration and asylum rather than a prejudice-based one. The project, SIRIUS, builds on a multi-dimensional conceptual framework in which host country or political institutional, societal and individual-related conditions function either as enablers or as barriers to migrants', refugees' and asylum seekers' integration via the labour market.