Lalaine Siruno Lalaine Siruno Arjen Leerkes Arjen Leerkes University of Krems Press 2025 Key points • Many countries have stock estimates of irregular migrants, but flow estimates are still scarce. • Irregular migration flows are more often measured through statistical indicators. • Compared to CLANDESTINO, the MIrreM Project has found that there are now more irregular flow indicators, particularly for geographic flows, and to some extent, also asylum-related status flows. • The available EU-level indicators for irregular flows are generally of good quality, particularly with respect to accessibility and documentation, but there are some limitations in terms of validity and reliability. PDFDocument eng 2025-09-30T11:05:32.090584Z 2025-09-30 Irregular migration flows flow indicators CLANDESTINO data quality EU migration statistics 919415 b application/pdf http://creativecommons.org/licenses/by-nc/4.0/