Abstract : The paper presents a project aiming at collecting, annotating and exploiting a dialogue corpus from a multimodal perspective. The goal of the project is the description of the different parameters involved in a natural interaction process. Describing such complex mechanism requires corpora annotated in different domains. This paper first presents the corpus and the scheme used in order to annotate the different domains that have to be taken into consideration, namely phonetics, morphology, syntax, prosody, discourse and gestures. Several examples illustrating the interest of such a resource are then proposed.