Simulations have played a relatively marginal role so far in design processes. In shifting towards an understanding of design as an activity informed by complex real-life processes within dynamic environments there is a growing need to revise this. The symposium is organised by OCEAN NORTH and co-hosted by the AA and the Oslo School of Architecture. Theo Lorenz on multimedia and architecture, and the interrelation between interactive systems and simulation techniques.Mike Weinstock on the history of the 'model' as a tool. Panel discussion.