I have been watching discussions on systems and people from many of you. The
principles of Systems Engineering and its use in Management is well
documented. The following are the excerpts from Chapter 6 of a TextBook
(volume I) published by Prentice Hall, 1997. You may find details on the web
page as follows:
Concurrent Engineering (CE) Fundamental Text Books Series (two Volumes):
http://www.prenhall.com/allbooks/ptr_0131474634.html
http://www.prenhall.com/allbooks/ptr_0133969460.html
============================================
6.31 Elements of a Functional System
In order for the system to be functional or work repeatedly, the following
must be true:
· Parts of a Whole Function: Each part must provide or contain a set of
partial but distinct functions by itself-functions that can be distinctly
identified as associated with each part of the whole.
· Whole of the Parts: A part or a combination of parts should work together
to accomplish the function (aim or purpose) of the whole system. Each is
capable of contributing a functional build-up leading to the system's
function-ality when every part is in place.
· Structure or Constancy-of-Purpose: There is a definite order (in some
instance priority) in which these parts need to be arranged to work as a
unit. The system requires a structure or a "constancy-of-purpose" to yield
the system's functionality.
Structure Û [Product, Process, Network and Work Hierarchy ]
(6.3)
Without a structure or a "constancy-of-purpose" there is no system. Take for
example, an exploded view of a product's subassembly. The view maintains the
assembly sequence by displaying a principal axis of a subassembly and by
placing the mating parts adjacent to each other with respect to a base part.
The precedence information is explicit in the exploded views. Without proper
assembly plans or sequences, there would not be any functional assembly.
Structures, like a cellular manufacturing organization or robots in a
flexible manufacturing system, are what makes factories work.
System Û [ Parts of a Whole Function + Whole of the Parts + Structure or
Constancy-of-Purpose ] (6.4)
If something is made of parts and it does not matter how these parts are
arranged, then we are dealing with a collection, a "heap," and not a system.
A pile of sand, a collection of stones, a mob, parts in bins, candies in a
candy-dispenser, or a pail of water are examples used to describe heaps.
There are three differences between a collection and a system, as shown in
Figure 6.1; A collection or heap has no structure. It exhibits randomness.
The size and location of the particles have no influence on the outcome. A
heap is uncorrelated. If we stir a heap, it will remain a heap, since each
part does not have a unique enabling or supporting functional role. However,
when the external environment is controlled, e.g., when water is poured into
a measuring glass or a container, it becomes a system. The glass along with
its markings now serves to define the volume the substance occupies. The
measuring glass, markings, and the weight-summary chart together provide a
purpose. This leads to a very interesting postulate.
Postulate: What is important or best for the whole system is nearly
identical with what would be the best in the long run for each of its
constituents. However, what is best for each individual constituent may not
be the best for the whole system.
-----Original Message-----
From: Jay Warner [mailto:
a2q@EXECPC.COM]
Sent: Thursday, November 04, 1999 12:20 AM
To:
MG-ED-DV@MAELSTROM.STJOHNS.EDU
Subject: Re: systems and people
mbayers@MMM.COM wrote:
> Folks --
>
> Russell Ackoff makes this point in his newest book, Re-creating the
> Corporation: there are systems and there are systems. He suggests
> five
> criteria that must be met for a system to be a system. I don't have
> the
> book in front of me, but in an earlier book he offered this:
>
> A system is a whole that contains two or more parts that satisfy the
> following five condition.
> 1. The whole has one or more defining functions.
> 2. Each part in the set can affect the behavior or properties of the
>
> whole.
> 3. There is a subset of parts that is sufficient in one or more
> environments for carrying out the defining function of the whole;
> each of
> these parts is separately necessary but insufficient for carrying out
> their
> defining function.
> 4. The way that the behavior or properties of each part a system
> affects
> its behavior or properties depends on the behavior or properties of at
>
> least one other part of the system.
> 5. The effect of any subset of parts on the system as a whole
> depends on
> the behavior of at least one other subset. . . .
> If the parts of a corporation do not interact, they form an
> aggregation,
> not a system.
> (The Democratic Corporation p 18-21)
snap response: Yes, this is getting there. The key word, I believe, is
'interaction.' To be a (an interesting?) system the parts must
interact. the idea of a goal/purpose could be a concept, imposed from
without. As your continuation suggests.
> He identifies four varieties, obviously to serve the purposes of his
> book
> and his line of thinking. In the new book he posits
> + mechanical systems, where neither the wholes nor the parts have
> purpose
> of their own (e.g., an automobile).
> + animate systems, where the whole has a purpose but the parts do not
> (e.g., a human being)
> + social systems, where the whole and the parts each have purposes
> (e.g., a
> politcal party)
> + ecological systems, where the whole does not have a purpose but the
> parts
> do (e.g. a forest)
>
> Now certainly you can take issue with his categories just as you can
> with
> any taxonomy. His interest lies with social systems, especially that
> variety known as the corporation.
As one who comes out of the technical system world, I _know_ there are
systems that don't know anything about purpose, but go right on
interactiong, and functioning, anyway. Thus, purpose could be a
construct grafted/imposed on the reality.
Steven J. Gould, for one, might argue that ecological/evolutionary
systems do not have purpose(s). He might even deny that these systems
make 'progress.' They simply retain the gene pool, conserving and
adapting it to meet new stresses.
Now. If 'purpose' is a construct imposed on the collection of
interacting pieces called a system, how does, and wherefrom comes, a
corporate purpose? Could this be what we mean by 'leadership'?
> Does this help clarify anything? Stir the mud?
>
> Michael A
> - Michael Ayers
Looks like I'll have to read Ackoff's book, too.
Jay
--
Jay Warner
Principal Scientist
Warner Consulting, Inc.
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