Today it is self-evident that across the world we all -- more or less -- live in plural cities. A number of factors connected to development and underdevelopment processes as well as to the phenomena of social polarisation on a world scale are seen to be connected to this transformation. As a consequence, new, unexpected geographies are being created and old phenomena are taking new forms and dimensions. In this new geography of exclusion, fostered by the mechanisms of the new capitalist system and the crisis of the welfare state, inequality in cities is spreading significantly. What are the objectives and issues of planning research in these new urban circumstances? How is it possible to define a planning research agenda able to face suc...