This special issue proposes a selection of papers presented at the symposium "Toward integrated modelling of urban systems" organized in Lyon on October 15-17, 2014 by the Laboratory of Transport Economics (LET, University of Lyon) on behalf of the French Scientific Network "Urban Modelling". The French Scientific Network "Urban Modelling" gathers stakeholders of the sustainable city, from upstream research to practitioners, with an objective of removing barriers between disciplines and stakeholders. The scope of urban modeling includes, without claiming any exhaustiveness, the built environment and the physical phenomena, the urban morphologies and the spatial and temporal dynamics, the nature and life in town. This scope mobilizes human and social sciences, sciences of the environment and engineering sciences. The main theme of the 2014 symposium was the integrated modeling of urban systems. The majority of the world lives now in urban areas which are quickly extending. This phenomenon raises issues in several dimensions: the economic one (efficiency of the city and costs for its stakeholders), the social one (cohesion, segregation and disparities of access to the amenities) and the environmental one (energy consumption, greenhouse gas emissions, loss of biodiversity, creation of man-made landscapes). The simultaneity of these problems calls up for an integrated approach into urban policies, their evaluation and consequently the modelling of urban processes.
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