An environmental simulation laboratory at the University of California, Berkeley, is testing the adequacy of different techniques for simulating environmental experiences. Various levels of realism, with various costs, are available in different presentation modes. The simulations can aid in communication about and the resolution of environmental issues, serve as planning tools and as the basis of educational films, depict technological innovations and fantasy futures, and assist research in environmental psychology. Simulators also further environmental impact assessment by acting as a means for monitoring public responses, estimating safety, stress and pollution, measuring potential problems of intrusion of privacy, access and distribution, relating identity, scale and diversity, and studying esthetics. As such, simulators can be used by committees and design teams, in public hearings, and for television presentations, although it must be recognized that simulation is still a developing science and therefore is still a tool with limitations. (PB)