Abstract
Abstract In order for an Intelligent Decision Support System (IDSS) to interact properly with a user, it must know what the user is doing. Accident Sequence Modelling ( ASM ) provides a possible frame of reference for monitoring operator activities, but it cannot be used directly: (1) operators may deviate from the scenario described in ASM , (2) the actual situation may developed differently from the scenario, (3) operators are normally involved in several activities at the same time, and (4) modelling of operator activities must focus on the level of individual actions, while the ASM only addresses the global view. The reference provided by the ASM scenario must therefore be supplemented by a more direct modelling of what the operator does. This requires a recognition of the operator's current plans, i.e. his goals and the strategies he employs to reach them. The paper describes an ongoing programme to develop an expert system that does this, within the ESPRIT project Graphical Dialogue Environment.
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