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One of the most difficult aspects of modeling complex dilemmas in decision-analytic terms is composing a diagram of relevance relations from a set of domain concepts. Decision mod els in domains such as medicine, however, ex hibit certain prototypical patterns that can guide the modeling process. Medical con cepts can be classified according to semantic types that have characteristic positions and typical roles in an influence-diagram model. We have developed a graph-grammar produc tion system that uses such inherent interre lationships among medical terms to f9-cilitate the modeling of medical decisions.

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