Comparison between the expected and actual legal proceedings of the two prefectural decrees (the Prefectural Decree of the departmental list of geological sites of interest and the APPG) according to the case study of Grignon and the Ferme de l’Orme. A. The expected legal proceedings are supposed to be fast and easy to enact due to their decentralised nature. B. The actual legal proceedings are considerably lengthened by unforeseen, yet necessary steps. Dark green: relatively long step; dashed contour: step only occurs when the territorial entities are concerned.