Urban Prototyping is the expanded documentation of the conference bearing the same name organized by the Institute of Architecture (IoA), which took place at the Vienna Museum of Applied Art in June 2007. A group of young architects and theorists reported and discussed their visions and experience in the zone in which the standards and effects of architecture and urban planning overlap. The participantsa (TM) cultural background and the fields they work in were markedly different. The range of demands was as broad as possible and included passenger transport reorganization measures in South American megacities as well as new planning for entire urban areas in Southeast Asia. Projects and measures ranging from buildings to patterns, architecture and infrastructure, all were examined. The prototype concept wasna (TM)t understood as the basis for serial production. It was perceived as the spatial, model-like formulation of a specific urban situation.