[From Bill Powers (2010.05.10.0956 MDT)]
Richard Pfau (2010.5.10.1045DST)
The major section entitled
“Control Theory” in Wikepedia seens to be a hard core
engineering view of control theory, perhaps better entitled
“Control Theory: Engineering Perspectives”.
The only references to the social sciences that I notice are (1) a link
to the section of Wikipedia entitled “Perceptual control
theory” under the heading “See also”, and (2) a statement
under the heading “Overview” that states that control theory is
“an interdisciplinary subfield of science, which originated in
engineering and mathematics, and evolved into use by the social sciences,
like psychology, sociology, and criminology.”
Control theory is an enormous field of engineering, dating back to the
1930s and 1940s. Most control engineers don’t know, or if they know they
don’t care, that it has applications in the life sciences. I looked at
the Wiki page you suggested and can’t figure out what its focus is. The
comments on it are pretty insane.
As you can see from
http://en.wikipedia.org/wiki/Control_theory, the basic model is
this:

See
http://en.wikipedia.org/wiki/File:Feedback_loop_with_descriptions.svg
for GNU licensing permissions.
Sigh. The “system” is what we would call the environmental
feedback function, and the “system output” is the controlled
variable. The “measured output” is the perceptual signal. The
“System input” is what we call the output quantity, and the
controller is the output function. The comparator and reference signal
don’t seem to be located in the controller, though they do connect
properly to the sensor or input function. The diagram isn’t exactly
wrong, but it has led to some pretty bizarre concepts of how control
works. It all depends on what you put inside the boxes.
Following the Wiki links to social science and psychology is very
discouraging. The best we can do is to keep developing PCT – most of the
world apparently has no inkling of what we’re doing. I think we just have
to sneak up on them.
As it now stands, if someone
with an interest in the social sciences were to access this section, they
would be stunned by the mathematics and views presented and leave feeling
that control theory is only for technocrats and not something for
them.
Well, it’s not. Perceptual control theory is a different matter,
though the math would still apply if one chose.
The problem here is that most of the people looking at these pages are in
that field and would not expect to find references to such squishy fields
as psychology or sociology. I don’t think the engineers realize how
difficult they have made this subject, not only for psychologists but for
themselves.
Best,
Bill P.