Abstract
Over the past 15 years a growing of European studies has led to an emphasis on managing dynamic environments in the laboratory (micro worlds) and in natural situations (field studies). This paper underlines the main planning demands linked to the dynamicity of the environment. It puts in evidence an invariant result from numerous empirical studies: the reduction of complexity by the operator. This reduction makes it at the same time possible to decrease the demands of the situation and to increase the cognitive resources available to master it. Two main strategies to reduce the complexity are described: the strategies that narrow the spatiotemporal field and the ones that broaden this field. These strategies are linked to the expertise of the; operator and to the dynamic characteristics of the situation. Some implications in the design of computer supports are suggested.
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