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C00002 00002	Dear Ms. Allen:
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Dear Ms. Allen:

	I find myself in a state of considerable annoyance, since I hadn't
committed myself to correct a blurb when I agreed to talk to Nils's class.
Unfortunately, the first paragraph is wrong in an essential way, so I'd
better take time to correct it or else you'll send it out as is, and my
colleagues will be angry with me for attacking MYCIN which wasn't my
intention.  The personal data is good enough, so here's a revised version of the
first paragraph.

Some Expert Systems Need Common Sense

	Common sense knowledge of the world and how to formalize it
is discussed.  Especially important for many purposes is knowledge
about the effects of actions.  Some tasks for which expert systems
are used require it and some don't.  These general considerations
are illustrated in connection with the task performed by MYCIN
medical expert system that helps a doctor diagnose and treat
bacterial infections of the blood.  MYCIN doesn't predict the
effects of actions and for many purposes this is unnecessary, but
for other tasks in the bacterial infection domain it may be
necessary.

Sincerely,

cc: Nils Nilsson