The thesis arises from a partnership work between the association “ le Groupement des Amis des Parcs Naturels Régionaux du Sud-Est ” (GAPSE) and the “Savoie Mont Blanc ” University. It was made within the CIFRE agreement (Industrial agreement of learning/training by research). The PhD focuses on the participatory component of the Integrated Water Resource Management (IWRM) in the regional nature parks in the south-east of France.The study relies on the feedback and the analysis of the participatory action research program called “L’Eau entre mémoire et devenir” (“Water between memory and future”), which has been created in 2008 by the GAPSE. Based on a survey methodology of key actors, the thesis identifies around thirty participatory actio...