This is a futures study based on the citizen initiative HS2020 in Hammarby Sjöstad, Stockholm. The initiative has the vision to “Renew a new city”, and further develop Hammarby Sjöstad’s environmental profile towards a sustainable development until 2020. The aim of this study is to explore the possibilities for HS2020 to also work with Collaborative Consumption, which involves the sharing of goods, services, and space, as a contributing factor to the sustainable development of Hammarby Sjöstad. This study uses an explorative scenario approach together with backcasting, a normative scenario approach to create future images of Hammarby Sjöstad in 2020. These images explore the possibilities for HS2020 to also work with Collaborative Consumption in six of their sub-projects. The futures images were generated based on three workshops with participants connected to HS2020’s work, and also on the literature study and the collected background information. The future images of Hammarby Sjöstad mediate how HS2020 could further develop the existing sub-projects, by focusing more on Collaborative Consumption. The solutions presented in the theory could be implemented in Hammarby Sjöstad. They could be for anyone, restricted to members, within an apartment building or a small group of people that could also own and maintain the sharing solution. Other important actors are private companies, the municipality and non-profit organization that could initiate, own and maintain these sharing solutions. The future images show that they could contribute to increased sustainability in different ways.

Cette thèse questionne le devenir du champ de l’Architecture urbaine en France, et, plus particulièrement, les possibilités d’une réactualisation de ses approches et théories projectuelles dans le contexte des mutations et prises de conscience plurielles au regard de la ville européenne contemporaine. Elle met en lumière les évolutions dans les modes de pensée et les notions structurantes du champ depuis sa définition dans les années 1970 et propose une remise en question des fondements du projet urbain, tels qu’ils ont été formulés en France depuis les années1980. L’idée d’une nouvelle approche projectuelle, celle du projet métropolitain, est enquêtée, d’une part, à travers une relecture critique des positionnements théoriques véhiculés en France (depuis la décennie 1980), et d’autre part, à travers un regard critique prospectif, au prisme de trois outils conceptuels et opératoires : récit, scénario, figure. Leur exploration fait apparaître le propre d’une culture narrative-descriptive où nouvelles postures intellectuelles, démarches réflexives et représentations mentales contribuent à développer les nouveaux sens du projet métropolitain, entre continuités et ruptures avec l’héritage du projet urbain. / This thesis questions new developments within the field of urban Architecture in France and, specifically, possibilities for the renewal of the discipline’s project approaches and theories, taken in the context of increased awareness towards the multiple challenges presented by the contemporary European city. It thus highlights fundamental changes in conceptual frameworks (ways of thinking and structuring notions) since Urban Architecture’s first definition in France in the 1970s, and critically analyses the “projet urbain” approaches, as developed in the French context since the1980s. The idea of the “metropolitan project” as a renewed urban planning and design approach is thus investigated both from a retrospective and a prospective critical view point : on one side, by reviewing the “projet urbain”’s theories and methods; on the other, by exploring three conceptual and operating design tools – narrative, figure and scenario. Within this emerging narrative-descriptive design culture, renewed intellectual stances, reflexive processes and mental representations help develop new meanings of the “metropolitan project”, marking both continuities and points of departure with respect to the legacy of the “projet urbain”.