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One can imagine many examples of hypothetical
situations where expert systems fall into ridiculous situations like
deciding that a man is pregnant, or believing that a 20 year old has
been working for 22 years. The bottom line of all these examples is
that the meanings of the symbols are in the mind of the programmer,
thus the constraints about these meanings are also in there. You
cannot predict every possible circumstance that your program is going
to get into, thus there will be some constraints that you forget to
encode.
Deniz Yuret
Tue Apr 1 21:26:01 EST 1997