In stage 2 the focus is on participation: the proposed siting regions have an opportunity to participate in the specification of the repository projects and in studies on the socio-economic effects and spatial planning impacts. The various sites also have to be compared from the point of view of safety before Nagra can propose at least two per waste category.
In stage 3 the remaining potential sites have to be examined in greater detail. In order to obtain equivalent knowledge in terms of safety, it will be probably necessary to carry out geological studies, including drilling exploration shafts. Before applications for general licences can be submitted, the principles governing compensation measures and the monitoring of social, economic and ecological impacts have to be formulated, and the question of form of compensation has to be dealt with.