Introduction; 1. IOM unbound? Obligations and accountability of the international organization for migration in an era of expansion Megan Bradley, Cathryn Costello and Angela Sherwood; 2. Who and what is IOM for? The evolution of IOM's mandate, policies, and obligations Megan Bradley; 3. The (Possible) responsibility of IOM under international law Jan Klabbers; 4. An assessment of IOM'S human rights obligations and accountability mechanisms Stian Øby Johansen; 5. A human rights due diligence policy for IOM? Helmut Philipp Aust and Lena Riemer; 6. The legal relationship between the UN and IOM: what has changed since the 2016 cooperation agreement? Miriam Cullen; 7. Crisis and change at IOM: critical juncture, precedents, and task expansion Christian Kreuder-Sonnen and Philip M. Tantow; 8. How IOM reshaped its obligations on climate change and migration Nina Hall; 9. the international organization for migration as a data entrepreneur: the displacement tracking matrix and data responsibility deficits Anne Koch; 10. IOM and ethical labor recruitment Janie Chuang; 11. The international organization for migration in humanitarian scenarios Geoff Gilbert; 12. IOM's engagement with the UN guiding principles on internal displacement Bríd Ní Ghráinne and Ben Hudson; 13. IOM's immigration detention practices and policies: human rights, positive obligations and humanitarian duties Angela Sherwood, Isabelle Lemay and Cathryn Costello; 14. IOM and 'Assisted Voluntary Return': responsibility for disguised deportations? Jean-Pierre Gauci; 15. Holding IOM to account: the role of international human rights advocacy NGOs Angela Sherwood and Megan Bradley.