Online formats, in contrast to oral (hearings) or written (submissions) exchange, offer comprehensive opportunities for participation and the aggregation of personal opinions, whether they are empirical (information about the nature of the affectedness) or normative (consultation in the narrower sense: what should be done from the citizens' point of view). Digital tools make it possible to evaluate these comments, even in the case of intensive participation from the citizenry, to systematize the empirical findings and to aggregate the normative comments.