The Research Theme Language Contact aims to investigate contact phenomena on both an individual and a societal level. On an individual level, we plan to examine how language systems interact within a bilingual speaker, which factors influence the language (dis)balance at the levels of the lexicon, grammar and discourse. One focus will be on language mixing. At the societal level, language attitudes and awareness of language contact will be determined. A long-term goal is to improve attitudes towards multilingualism in society by providing scientifically robust evidence.