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Refinement tools assist with debugging a KBS's knowledge, thus easing the well-known knowledge acquisition bottleneck, and the more recently recognised maintenance overhead. Existing refinement tools are developed for specific rule-based KBS environments, and have usually been applied to artificial or academic applications. Hence there is a need for tools which are applicable to industrial applications. However, it would be wasteful to develop separate refinement tools for individual shells;doi:10.1016/s0950-7051(99)00018-0 fatcat:avhhjemgdza4ph4vhzdnbzjsf4