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The growing number of production enterprises that use software systems to support the production planning and control (PPC-systems and limited life-time of these systems imply that many enterprises have to decide whether or not an existing PPC-system is worthwhile reengineering. The factores that have an impact on this decision are non-quantifiable. Since the fuzzy-set-theory provides facilities to deal with non-quantifiable variables, a decision-tool based upon a fuzzy model was conceived.