From varieties in contact to the selection of linguistic resources in multilingual settings

International audienceThis chapter focusses on various methodologies we can rely on to study heterogeneity and dialectal variation among multilingual speakers. We first focus on linguistic variation in contact settings and present a methodology to describe heterogeneous and multilingual corpora and show how languages sometimes overlap. A second part focusses on (dialectal) language boundaries and how speakers may sometimes use unmarked elements showing fuzziness or reorganization of language boundaries. The role of ideology is highlighted in discourse but also at play in language practices and in doing-being 'multilingual', 'urban and modern' or performing authenticity. The third part focusses on how speakers use dialectal and linguistic resources from their linguistic repertoire in their everyday life interactions as stances and acts of identity