By Jasmijn Slootjes and Ravenna Sohst

Across Europe, concerns about irregular migration have dominated media headlines and shaped recent elections. Discussions of and policymaking related to irregular migration are often a numbers game, fueled by the latest estimates of changing migration trends and migrant populations. Data on irregular migration also influence decision-making, advocacy, and strategic and operational planning of a wide range of governmental and nongovernmental actors.

But despite playing such important roles, data on irregular migration are often inadequate—either lacking altogether, uneven, or difficult to access. This has consequences for policymakers, service providers, and other stakeholders that would benefit from better access to reliable data.

This MPI Europe policy brief explores obstacles that hinder the effective collection and use of irregular migration data, how this affects policymakers and other actors, and potential avenues for strengthening the evidence base. This study, which is part of the Measuring Irregular Migration and Related Policies (MIrreM) project, draws on insights shared in workshops and interviews by policymakers, subject matter experts, NGO representatives, and other stakeholders.

Brussels: Migration Policy Institute - Europe, 2024. 18p.