ReROOT is an EU-funded project dedicated to fostering evidence-based integration policies and imaginaries. ReROOT starts off with ethnographic action research in nine sites in Belgium, France, Greece, Hungary, the Netherlands, Turkey and the United Kingdom. Here, ReROOT will bring into view and into conversation the wide constellation of actors that constitute the local arrival infrastructures. Based on the results of these research activities, ReROOT develops mapping toolkits and platform prototypes for civil society and public service stakeholders to continue the work ReROOT can only begin to do.