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Policy formation involves the interaction of two systems, the environmental system and the human cognitive system which attempts to form a judgment about it. At present, the interaction between these two systems is not under rational control. That is, although a) interactive computer models of environmental systems have been constructed and are in increasing use, and b) interactive computer models of human judgment have been constructed and have been found to be of practical use, c) links between the two until recently have not been considered. The specific aim of this article is to describe such a link for the purpose of developing an aid for planners and policy makers.