The book revisits the Human Data Interaction (HDI) framework (Mortier, Haddadi, Henderson, McAuley, and Crowcroft 2014) through many diverse cross-sectoral perspectives. These are co-authored under the HDI framework’s key tenets of: agency, legibility, negotiability and resistance. These tenets form the main sections of the book, with chapters examining these concepts through both interdisciplinary academic literature and cross-sector dialogue with individuals and agencies from the wider community who work with diverse and often disadvantaged groups.