A new Fernbank Museum of National History, to be located in Atlanta, is in the planning stage. A major series of exhibits is entitled “A Walk Through Time.” The walk culminates in exhibits which address the future. The museum planners wish to introduce the museum audience to computer modeling as an increasingly powerful tool with which to address societal problems. One exhibit is to present an exemplary computer model whose role is primarily tutorial. The model will treat limited facets of an urban system. The exhibit will present the model at two, or perhaps three, tiers of sophistication. The simplest presentation will utilize stored computer output in order to demonstrate model structure, interactions within the system, and some behavior patterns. Another presentation, also utilizing stored computer output, will allow audience participation in a restricted choice of model parameters. There may be a third exhibit tier in which less restricted parameter changes can be made in an interactive model.