Discussant presentation 'Migration gaps and needs' by Helga de Valk at the IMISCOE Semi Plenary 'IMISCOE meets the European Commission: KCMD and and DG Research and Innovation'. Discussion on migration data and migration research gaps in view of strengthening evidence-based migration policy. The IMISCOE Semi Plenary is part of the 14th IMISCOE Annual Conference on Migration, Diversity and the City, 28-30 June 2017, Rotterdam, The Netherlands.