The Italian Law 394/1991 provides the tool of the Park plan to protect the natural and environmental values entrusted to the Park Authority. The plan splits the territory on a different level of protection basis. It's drawn up by the Body upon collaboration and mandatory opinion of the Park Community (body formed by the territories majors, Presidents of the Regions, Turin Metropolitan City, Gran Paradis mountain Union and Orco and Soana valleys), it is then approved jointly by the Piedmont and Valle d'Aosta Regions.