We are pleased to announce our forthcoming edited collection with contributions co-authored by ARITHMUS researchers. The book, Data Practices: Making Up a European People, edited by Evelyn Ruppert and Stephan Scheel, will be published in September 2021 by Goldsmiths Press/MIT Press. The book addresses how EU data practices establish and assign people to categories, and how this matters in enacting—“making up”—Europe as a population and people. Five core chapters explore key categories of people—usual residents, refugees, homeless people, migrants, and ethnic minorities—and how they come into being through specific data practices such as defining, estimating, recalibrating and inferring. Two additional chapters address two key subject positions that data practices produce and require: the data subject and the statistician subject.