Based on 20 countries across Europe, North America and North Africa, this report of the MIrreM research project, synthesises key trends and patterns of national policy approaches towards migrant irregularity, highlighting commonalities and differences across various contexts, including the one in Greece. In particular, this report examines three key research questions: how have irregular migration policies evolved over time and in response to what; what pathways into and out of irregularity have these policies produced or aimed to address; and what challenges have hindered policy implementation. In doing so, the report aims to contextualise irregular migration policy changes, as well as how such policies can channel migrants into or out of irregularity.