Nagra's role is to elaborate the necessary geological information required for the search for sites and to propose potential locations. The federal authorities monitor each stage of the selection procedure. The Federal Council decides whether each of the three stages has been concluded successfully. On conclusion of the site selection procedure, the Federal Council is also responsible for issuing the licence(s) for deep geological repositories. The Federal Council's decision to licence sites will be submitted for approval to Parliament. Voters will have the last word on the matter through a national referendum.