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[en] The purpose of this article is to clarify the theoritical base necessary for the design of a computer-based simulation of temporal reasoning. Simulation allows a better understanding of phenomena that appear in working situations and even, understanding and preventing some human errors. In order ot illustrate theoritical concepts, we will provide examples of a situation in which the dynamic character of the evolution, the critical character of the planning and of the synchronization force temporal reasoning. This situation will be that of anaesthesia.