The discursive dimensions of interactions in a communication situation are a study area that is given particular emphasis, taking account of the audio-scripto-visual aspects of these discourses, always seeing them as embedded in social practices and usages. The research looks at the various forms of the interface and interaction between the linguistic aspect on the one hand, and the social, cognitive and technological aspects on the other. One example is the analysis of social discourses, which activate and regulate social relationships at different levels (in interindividual relations as well as at the more macro level of social functioning in general). In this context, the patterns of these written, oral and electronic discourses are analysed in terms of utterance context, heterogeneity of discourse, discourse genres, discursive and linguistic formations and manifestations of memory. The study of these trans-semiotic objects (TV soaps, comic strips, songs, adverts, etc.) which are characterised by the interaction of different semiotic systems calls for an interdisciplinary approach appropriate to the communication sciences. The same goes for studying the construction of knowledge within educational systems that make use of multiple semiotic registers (in the context of classroom interactions or use of media products designed for educational purposes). When it comes to organisations, social discourses are often linked to matters of corporate culture, whether at the level of exchanges among the social actors involved in the life of the organisation, or connected with the various levels of culture present in the company (macro, meso or micro).