Gatti G., Scotto d’Apollonia L., Dosias-Perla D., Vouriot P., Barth, L. 
The PERC²ES project aims to integrate the social dimension into the management of the coastal marine environment, through the experimentation of a participatory approach between local stakeholders. 2020 was a year of prefiguration for engaging in a multidisciplinary approach based on the specific tools of Participatory Action Research (RAP): testing participatory methods for co-construction, co-definition of objectives and actions to be taken, up to co-analysis and discussion of results by associating a diversity of participants (scientists, citizens, coastal actors, land managers, institutions). In its foreshadowing year, the field of action was the Marseille coast, a territory rich in natural resources, very popular among tourists, highly urbanized and subject to numerous anthropogenic pressures. The man-natural environment relationship is very close here, whether for professional or leisure activities; it is therefore obvious that for the sustainable management of this coastline, the environmental and social dimensions are inseparable. Since 2015, this coastline has been the subject of an action program led by the Métropole of Aix Marseille Provence and the City of Marseille: the Bay Contract. This program aims to preserve the littoral and the coastal environments while supporting the harmonious development of human activities. This is the ideal context for the implementation of the PERC²ES project.