In a face-to-face collaboration, participants use a large part of contextual information to translate, interpret and understand others’ utterances by using contextual cues like mimics, voice modulation, movement of a hand, etc. Such a shared context constitutes the collaboration space of the virtual community. Explanation generation, one the one hand, allows to reinforce the shared context, and, in the other hand, relies on the existing shared context. The situation is more critical in e-collaboration than in face-to-face collaboration because new contextual cues are to be used. This chapter presents the interests of making explicit context and explanation generation in e-collaboration and which types of new paradigms exist then.