Project C02 focusses on the socially agreed-upon requirements and interactions of the discourse functions, discourse situation, and social characteristics of the addressee on the intra-individual variation at the lexical, phonetic/phonological and posture levels. The idea is to develop a novel methodology to study Situated Interaction in which language users complete verbal tasks towards an interlocutor presented on video. This experimental set-up enables the elicitation of production data in a range of systematically controlled discourse and functional situations, unlikely to be found in naturalistic data (or speech corpora). Perception tests will then assess language-users’ expectations and attitudes towards speech variation of speakers in these different situations.