Following the industrial background, the necessity of the innovation is found at the level of the urban systems. The innovations are not only researched at the level of the results of the urban projects but also in the processes which see them born and develop. In addition, both the societal evolutions, described by the social and human sciences, and the results of multidisciplinary researches wonder about the involvement of the citizens / users in the process of output of the city. The emergence, for few years, of the Living Labs probably gives new opportunities to lead a reflection on the involvement of the citizens in the urban projects. From then on, it consists in mixing the questionings held by the user-driven open innovation and the stakes of "democratization" of the urban projects. It is in particular what suggests the Lorraine (NIT) Smart Cities Living Lab.