We describe a simulation of turn-taking in small group discussion which includes behaviours from a range of modalities such as speech, gaze, facial expression, gesture, and posture. The simulation is intended to show how these behaviours contribute to the turn-taking process. The agents that participate in the discussion make probabilistic decisions about whether or not to exhibit behaviours such as speaking, making a backchannel, or shifting posture, within a general framework suggested by the existing largely descriptive literature on turntaking. The group behaviours that characterize turn-taking models, such as turns, simultaneous speech, and competition for the oor, emerge from the individual behaviours of the agents. At this stage in the project the basic model has been designed and prototyped
