I n this paper, we propose a new version of Petri Netsenhanced high-level fuzzy Petri net (EHLFPN) to represent fuzzy ruIes in knowledge bases. In the proposed model, fuzzy inference can be performed using a method similar to [3]. In addition, improper knowledge such as conflicts, redundancy, cycles, unnecessary conditions, dead ends, and unreachable goals, can be detected b y first transforming fuzzy Petri nets into non-fuzzy Petri nets and then transforming the derived Petri nets into the reachability problems. At last, each type of improper knowledge is detected b y solving a set of equations formulated from the corresponding reachability problem.
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