With the Data Charter for Citizen Science, Scivil, the Flemish knowledge centre for citizen science (CS), provides a guide to achieving well-documented data in a citizen-science project. The charter is for everyone who wants to start or participate in a citizen-science project, i.e. both project initiators and participants (citizen scientists) from all sectors of the ‘quadruple helix’ (citizens, public authorities, scientific institutions, privat…