Tourism in urban environment has to be considered in a global way that transcend the disjointed sectorial studies, it has to be observed as a continuous phenomenon in time and space and it raises issues about the integration of the tourism impacts assessment in the planning process. We tackle those three reflexion paths through the notion of cumulative impacts; this approach leads to the definition of a framework based on the search for global change rather than on the definition of sectorial carrying capacities. The search for global change has been developed in the transportation planning field as the notion of induced effects. Because of theoretical and methodological problems that appeared, the notion of induced effects deserves an approach that consider the mutual adaptation between tourism and urban environment.