7. The knowledge system as claimed in claim 6, wherein said means for comparing includes means for comparing factor identified by said subject system to said factors that are consistent with said conclusions to determine missed factors which are consistent with said conclusions but not identified by said subject system, and said means for probing includes means for probing the subject system for values of said missed factors.
7. The knowledge system as claimed in claim 6, wherein said means for comparing includes means for comparing factor identified by said subject system to said factors that are consistent with said conclusions to determine missed factors which are consistent with said conclusions but not identified by said subject system, and said means for probing includes means for probing the subject system for values of said missed factors. 8. The knowledge system as claimed in claim 7, wherein said means for comparing includes means for comparing values identified by said subject for said missed factors to actual values used by said knowledge system for said missed factors, and means for indicating portions of said knowledge base which mention the actual values of missed factors when the values identified by said subject system differ from the actual values of said missed factors.