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An evacuation model was developed in a research project of the Ministry of Construction: "Development of Fire Safety Design Method of Buildings". The model is to be used as a tool for an evacuation design. It is to predict and evaluate evacuation time of people in a fire. The scope of application of the model is restricted only to the evacuation of low level hazard. This is a kind of network model and assumes that evacuees move like a fluid. The predicted results using the model are compared with the observed egress time by field measurements of Tsukuba Int'l Expo185. The comparison showed that they were in good agreement. Consequently, this evacuation model can be used as a reasonable tool for design purposes. Also, a method was developed for visual presentation of the predicted evacuation behavior by personal computer graphics.