Based on a broad mapping of regularisation practices in the EU, as well as detailed case studies, MIrreM will develop ‘regularisation scenarios’ to better understand conditions under which regularisation should be considered as a policy option. Together with expert groups that will be set up on irregular migration data and regularisation, respectively, the project will synthesise findings into a Handbook on data on irregular migration and a Handbook on pathways out of irregularity. The project’s research covers 20 countries. MIrreM will analyse policies defining migrant irregularity, stakeholders’ data needs and usage, and assess existing estimates and statistical indicators on irregular migration in the countries under study and at the EU level. In addition, it will develop innovative methodological approaches for estimating different aspects of irregular migration.