his internship thesis, which focuses on territorial studies, aims to demonstrate and report on an immersive professional experience within a characteristic public administration, namely the municipality of Scientrier in France, which is marked by its rural-village character and its integration into the Greater Geneva Area. We will have the opportunity to analyze and question in depth the operationality of this municipal community's preferred tool, its Local Urban Development Plan, in order to put it into perspective and reconsider it through the prism of cross-border issues, such as demographic pressure and the emergence of new ambitions for ecological transition. Between analysis and critical study of municipal urban planning and management tools, we will combine this reflection with an evaluation of the sensitive, lived, and practical experiences of rural urban planning and its development tool, the PLU. This thesis thus paves the way for the design of a PLU that embodies an operational urban planning lever, both spontaneous and transitional.