© 2000 Todd Neller.  A.I.M.A. text figures © 1995 Prentice Hall.  Used by permission.
Introduction to Uncertain Reasoning
•Qualification problem in FOL
–e.g. car doesn’t start
•Problems:
–no exceptions? ή big rules!
–no knowledge of likelihood of each exceptions
–no complete theory (e.g. medical science)
–even given complete rules, sometime we only have partial evidence