[From Bruce Gregory (981108.1105 EDT)]
Thanks to Marc Abrams, I have just finished reading Bill's article, "Control
theory: a model of organisms" that appeared in 1990 in the Systems Dynamics
Review (6, 1-20). It is Bill at his very best -- clear, concise, and
persuasive. I recommended it to anyone who has not yet read it. The article
can serve as a succinct, informative introduction to PCT.
Bruce Gregory