Rapidly increasing migration flows contribute to the development of multiple forms of social and cultural differentiation in urban areas - or to 'super-diversity'. Language diversity is an important part of the resulting new social and cultural constellations. Although linguistic diversity is not a new phenomenon per se, the response of individuals or education systems to it is still largely based on a monolingual habitus, associating one nation (or a region within a nation) to one language. Building on the top-quality expertise of researchers from different academic fields, the volume...