Recognising that discussion is not limited to whole class conversations, but also may occur in dyads or small groups provides opportunities for more shy students to engage without having to speak in front of the entire class. Organising students into teams has the added benefit of creating a sense of community and belonging even when the course has large numbers of students enrolled. This sense of community also creates positive peer-pressure to be prepared for the discussion by completing reading assignments and to engage in the conversation.
See Think-Pair-Share strategy which allows for discussion in a dyad.