Settle a disagreement about lack of self-control not being the same as
compulsive behavior. One definition of compulsion is "an irresistible
urge". If one has an urge that one does not resist in spite of
negative consequences, is that not in effect a compulsion?

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Clarification of Question by meego-ga on 10 Oct 2002 08:27 PDT

Thanks Tehuti, that helps. Perhaps what I'm looking for has more to do
with an addictive behavior rather than a compulsion. Since the
behavior is an activity rather than the use of a substance the
definition of "addiction" is controversial. The person claims not to
have a "problem". He says it has only gotten him into trouble because
he "lacks self-control". This lack of self control has cost him a job,
relationships, etc. How do I know that this isn't just denial?

Compulsion:    Uncontrollable, repetitive, and unwanted urge to
perform an act; serves as a defense against unacceptable ideas and
desires, and failure to perform the act leads to overt anxiety.
From a glossary of psychological terms at
http://www.planetpsych.com/zPsychology_101/glossary.htm

I think the key words here is repetitive.  When someone keeps doing
something over and over because they feel they must, in spite of the
fact they don't want to do it, it is a psychological illness, and then
deserves the name compulsion.

I have not posted this is an answer, because it is not a very detailed
response. Perhaps some other researcher may wish to follow up on this
line of thinking.