During the last 30 years the techniques of the 3D-environmental simulation have been developed from endoscopic photographs with simple scale models to highly complex computer generated virtual worlds. Environment-behavior-studies, experimental aesthetics, teaching architecture and urban design, support for design decisions in architecture and urban planning, citizen information and participation as well as project presentation, project marketing and tool for decision-making processes of public and private clients – a wide range of applications has lead to a project oriented use of different media. With different contributions the symposium wants to discuss the variety of application fields as well as the potentials and limitations of 3D-environmental simulation.