6. The knowledge system as claimed in claim 1, wherein said means for probing includes means for probing said subject system for conclusions, means for probing said subject system for factors that support said conclusions, and means for probing said subject system for values of factors that are consistent with said conclusions.
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.