Bill's comments

[From: Bruce Nevin (Thu 930916 15:59:17 EDT)]

( Bill Powers (930916.0845 MDT) ) --

>Here, LP in a box abbreviates the control hierarchy for layered-
>protocol communication using various means such as language.

Try it with two LP boxes, one of them in B.

There is an LP box inside B. You just can't see it because I drew B so
small in the environment of A in this diagram. Here it is again:

                                             :
                                     +------>:----+
                                    e> : |
                                r +-+-+ : |
                           +------>| 2 | : |
                           > +---+ : | d
                         +-+-+ ^ : |<----
                   +---->| 1 | p| : |
                   > +---+ | : |
                   > ^ | : |
                   > > > : |
                   > +---------+-------:<---+
                 +-+-+ :
           ----->| 0 | +----------->:-------+
                 +-+-+ | : |
                   ^ +-+-+ : |
                   > --->| LP| : | +-----+
                   > +---+ : | | |
                   > ^ : |<--+CS B |
                   > > : | | |
                   > > : | +-----+
                   +------------+------------:<------+
                                             :
                                             :
                                             :
                            CONTROL SYSTEM A : ENVIRONMENT
                                             :

Abbreviation by "chunking" like this is one way to make these diagrams
wieldy. However, the abbreviation needs to be explicitly stated, and I
did not, and I accept this as your very properly calling me on that.
Sorry: I was in a hurry.

···

-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-

>Note that LP and 1 and 2 (or the system of 1 over 2) are
>mutually autonomous with respect to explicit signals in the
>model. What links them is the affect associated with error
>whatever its origin, perhaps.

But isn't the "affect" still a perception inside A or inside B? I
don't see any way for A's affect to reach B's perceptions or vice
versa.

LP, 1, and 2 (or 1-over-2) are all within A. See diagram above. Empathy
between A and B is, I assume, "a nonverbal aspect of the LP box" in each,
as I said.

-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-

My only
deep objection is that on 8-1/2 x 11 paper, there's more room to
draw higher levels upward than there is sideways.

Here's a compressed version if accumulation of levels is a concern. The
cost of doing away with boxes around comparators is that they are
highlighted only by the characters ^, >, + surrounding them on bottom,
left, and top, respectively.

                              ea2 :
                        ea1 +-->:--+
                  ea0 +---->2 : |
                   +---->1 ^ : |<--D
                   > ^ pa2| : |
                   > pa1| | : |
                   > +-----+---:<-+
                   > :
             ra0 | eaL :
           ------> 0 raL +----->:--+
                   ^ ---->LP : | +--+
                pa0| ^ : |<--+CS|
                   > > : | | B|
                   +--------+------:<-+ +--+
                                   :
                  CONTROL SYSTEM A : ENVIRONMENT
                                   :

And of course the familiar top-to-bottom orientation is always available
when we want a lot of depth. This is merely an option. Especially when
talking with engineering control theorists, perhaps. A test of
our flexibility.

-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-=+=-

Just sent an enquiry re employment to a company called Avalanche in
Boulder, which was just acquired by Interleaf Inc., makers of the WYSIWYG
technical publishing systems we use. Who knows.

    Bruce
    bn@bbn.com (still)