Chris Greenhalgh, Steve Benford, Mike Craven
School of Computer Science and Information Technology
University of Nottingham
UK

Phone: (0115) 951 4221
Fax: (0115) 951 4254
cmg@cs.nott.ac.uk

Inhabited Television takes traditional broadcast television and combines it with multiuser virtual reality, to give new possibilities for interaction and participation in and around shows or channels. "Out Of This World" was an experimental inhabited TV show, staged in Manchester, in
September 1998, using the MASSIVE-2 system. During this event we captured comprehensive records of network traffic, and additional logs
of user activity (in particular movement and speaking). In this paper we present the results of our analyses of network and user activity in these
shows. We contrast our results with those obtained from previous analyses of teleconferencing-style scenarios. We find that the inhabited
television scenario results in much higher levels of user activity, and significant bursts of coordinated activity. We show how these characteristics must be taken into account when designing a system and infrastructure for applications of this kind. In particular, it is clear that
any notion of strict turn-taking (and associated assumptions about resource sharing) is completely unfounded in this domain. We also show that
the concept of "levels of participation" is a powerful tool for understanding and managing the bandwidth-requirements of an inhabited television
event.