Some system
thinkers and their ideas
Copyright 2017 Graham Berrisford. One of
several hundred papers at http://avancier.website. Last updated 23/03/2019 20:06
The systems
of interest here are islands of orderly behavior in
the ever-unfolding process of the universe.
The role of system architects is to observe baseline systems, envisage target systems, and describe both.
So, you might assume architects are taught about system theory and systems thinking; but this is far from the case.
Contents
Classical
cybernetics - the science of system control
General
system theory – the cross-science notion of a system
System
Dynamics – animating a system model to predict long-term outcomes
Soft
systems thinking – loosening the system concept
Decision
theory - or theory of choice
Second-order
cybernetics – undermining the system concept
Footnote
1: Two more sociological systems thinkers
Footnote
2: a couple of half-baked comparisons.
Read the science and philosophy of systems thinking for a brief history of the universe.
The discussion there is of how humans came to conceptualise the world in terms of systems.
Willard Gibbs (1839 – 1903) was a scientist, instrumental in the development of chemistry into a science
He defined a system as “a portion of the ... universe which we choose to separate in thought from the rest of the universe."
But if every entity we think of is a system, one for one, then the concept of a system has no value.
Let us use the term “entity” for any portion of the universe we can locate in space and time
And look at how the term “system” has been given more interesting and useful meanings.
Read thinkers who foreshadowed system theory for ideas attributed to the thinkers below.
·
Adam Smith (1723 to 1790) subdivision within and competition between systems.
· Charles Darwin (1809 to 1882) system mutation by reproduction with modification.
· Claude Bernard (1813 to 1878) homeostatic feedback loops.
· Herbert Spencer (1820 to 1903) social systems as organic systems.
· Vilfredo Pareto (1848 – 1923) the Pareto principle.
· Emile Durkheim (1858-1917) collective consciousness and culture.
· Gabriel Tarde (1843 –1904) social system as emergent from the actions of individual actors.
· Max Weber (1864-1920) a bureaucratic model – hierarchy, roles and rules
· Kurt Lewin (1890–1947) group dynamics.
· Lawrence Joseph Henderson (1878 to 1942) meaning in communication
· Talcott Parsons (1902-1979) action theory.
These thinkers may not have spent much time analysing what the word “system” means.
The term may have been used some to mean only "a group of interrelated things".
And not all of their ideas stand the test of time; however, they did influence 20th century systems thinkers.
When “system theory” became established as a topic in its own right is debatable.
Some suggest system theory is a branch of
sociology.
“Systems theory, also called social systems theory... https://www.britannica.com/topic/systems-theory
Others suggest the reverse, that social systems thinking is branch of general system theory.
“Though
it grew out of organismic biology, general system
theory soon branched into most of the humanities.” Laszlo and
Krippner.
It is certainly true that the general
concept of a system became a focus of attention after second
world war.
And there was a burst of systems thinking in the period 1945 to 1980.
Before we look at that, here are couple of generalisations to be borne in mind
Inside a system there are actors and
activities
Actors are structures that exist in space and perform activities.
Activities are behaviors that happen over time, and change the state of the system or something in its environment.
The actors and activities can be orderly in the sense that they conform to some roles and rules.
The roles and rules can be described, and the conformance of a system’s behavior to the rules can be assessed.
There are natural and designed (accidental
and purposive) systems
A designed system is often described in terms of aims (motivations), activities (behaviors), actors and objects (structures).
It is created by intent, with aims in mind - though its outcomes may diverge from its aims.
By contrast, a natural system (e.g. the solar system) evolves without any intent.
Some refer to its outcomes (e.g. stable orbits) as its aims, but really they are unintended consequences.
Read the systems of interest for some more common ideas about systems.
Cybernetics
is the science of systems in which biological or mechanical actors
process information.
Thinkers in this domain include:
· Norbert Wiener (1894-1964) the science of system control.
· W. Ross Ashby (1903-1972) the law of requisite variety.
· Alan Turing (1912 –1954) finite state machines and artificial intelligence.
The Ratio Club, which met from 1949 to 1958, was founded by neurologist John Bates to discuss cybernetics.
It members included Alan Turing and Ross Ashby.
Many of its 21 members went on to become prominent scientists - neurobiologists, engineers, mathematicians and physicists.
For some,
to understand systems thinking requires making a paradigm shift as radical as
is needed to understand Darwin’s evolution theory.
In discussion, people often refer to a named entity as a system.
They point at a machine or a business (like IBM) and say "the system is that thing there".
But with no further description, that is vacuous to the point of being meaningless.
Ashby, Ackoff, Checkland and other systems thinkers emphasise that a system is one perspective of a reality.
Russell Ackoff spoke of abstract systems and concrete systems.
An abstract system (e.g. the laws of tennis) describes how some part of the word behaves, or should behave.
A concrete system (e.g. a tennis match) is some part of the world that conforms - well enough - to an abstract system.
|
Systems as abstractions |
|
Abstract systems (descriptions) <create and use> <represent> Systems thinkers <observe & envisage> Concrete
systems (realisations) |
A concrete system can be viewed in two ways.
You can think of it as what Ashby called “the real machine” – typically a concrete structure in motion.
Or instead, as the extent and accuracy to which that structure’s behaviour realises the abstract system.
(Bear in mind that the same structure may realise other systems at the same time.)
Another idea
important to cybernetics is the concept an information feedback loop.
Information
is encoded in flows or messages that pass between systems.
A control
system:
·
receives
messages that describe the state of a target system
·
responds by sending messages to direct activities in the target
system.
Information
feedback loops are found in both organic and mechanical systems:
·
A
missile guidance system senses spatial information and sends messages to direct
the missile.
·
A
brain holds a model of things in its environment, which an organism uses to
manipulate those things.
·
A
business database holds a model of business entities and events, which people
use to monitor and direct those entities and events.
·
A
software system holds a model of entities and events that it monitors and
directs in its environment.
Read Introduction to Cybernetics and Ashby’s ideas for more on cybernetics.
In the 1950s, Turing thought that computers
would give us insights into how the brain works.
Here, the brain’s ability to typify and
predict things is more interesting than its workings.
The 1954 meeting of the American Association
for the Advancement of Science in California was notable.
Some people at that meeting conceived a society for the development of General System Theory.
They included:
· Ludwig von Bertalanffy (1901-1972) the cross-science notion of a system
· Kenneth Boulding (1910-1993) applying general system theory to “management science”.
· Anatol Rapoport (1911 to 2007) wrote on game theory and social network analysis.
Bertalanffy was a biologist who promoted the idea of a general system theory.
His aim was to discover patterns and elucidate principles common to systems in every scientific discipline, at every level of nesting.
He looked for concepts and principles applicable to several disciplines or domains of knowledge rather than to one.
“There exist models, principles, and laws that apply to generalized systems or their subclasses, irrespective of their particular kind.”
Bertalanffy related system theory to communication of information between the parts of a
system and across its boundary.
“Another development which is closely connected with system theory is that of… communication.
The general notion in communication theory is that of information.
A second central concept of the theory of communication and control is that of feedback.”
“Every living organism is essentially an open system. It maintains itself in a continuous inflow and outflow…”
So, general system theory incorporates cybernetic concepts such as:
· System environment: the world outside the system of interest.
· System boundary: a line (physical or logical) that separates a system from is environment.
· System interface: a description of inputs and outputs that cross the system boundary.
· System state: the current structure or variables of a system, which changes over time.
Cooperation
and conflict between actors in a game
When actors interact in a system, they don’t necessarily help each other.
They may cooperate, as within a football team or a business system.
They may compete, as in a game of chess or a market, or hurt each other, as in a boxing match or a war.
Cooperation, conflict and conflict resolution is a focus of bio-mathematics and game theory.
Read Introducing general system theory for more.
System Dynamics was founded and first promote by:
· Jay Forrester (1918 to 2016) every system is a set of quantities that are related to each other.
· Donella H. Meadows (1941 to 2001) resource use, environmental conservation and sustainability.
Read these papers for more.
·
System
state change by circular causal loops
Today, akin to system dynamics, there are agent-based approaches to the analysis of systems.
Bertalanffy didn’t
like some directions in “the System Movement”, especially those specific to one
science.
However, he saw the
movement as “a fertile chaos” that generated many insights and inspirations.
General system
theory doesn’t start from or depend on sociology, or analysis of human behavior.
However, it stimulated
people to look afresh at social systems in general and business systems in
particular.
The term “soft system” emerged in the 1970s.
Three well-known soft system thinkers are:
· Peter Checkland (born 1930) the Soft Systems Methodology.
· Stafford Beer (1926- 2002) management cybernetics and the Viable System Model.
· Russell L Ackoff (1919-2009) human organisations as purposeful systems.
Checkland observed the distinction between hard and soft system approaches is slippery.
The distinction between hard and soft systems is also questionable.
Read Soft Systems for more.
The main problem with soft systems is the confusion of a social group or network with a social system.
This confusion is explained and resolved in other papers.
Ackoff noted that the actors in a system described as per classical cybernetics act according roles and rules.
By contrast, the actors in a social system have free will and can act as they choose.
This prompts the question as to how people do, or should, make choices.
· Herbert Alexander Simon (1916 to 2001) was a political scientist, economist, sociologist, psychologist, and computer scientist.
· Anatol Rapoport (1911 to 2007) wrote on game theory and social network analysis.
A biologist or psychologist may look to instinct, homeostasis, emotions or Maslow’s hierarchy of needs as the basis for making decisions.
A sociologist or mathematician may take a different perspective.
According to Wikipedia, Herbert Simon argued that fully rational decision making is rare: human decisions are based on a complex admixture of facts and values.
And decisions made by people as members of organizations are distinct from their personal decisions.
He proposed understanding organizational behavior in humans depends on understanding the concepts of Authority, Loyalties and Identification.
|
Observations: A theory of why and
how humans conform to group norms has to start from the evolutionary
advantage it gives them. Authority,
Loyalties and Identification are matters for biology and management science
rather than a general system theory. |
Whereas game theory is concerned with choices made by agents in interactions with other agents - as in a game of poker.
Decision theory is concerned with the choices - between options - made by individual agents regardless of such a structured interactions.
“Decision theory (or the theory of choice) is the study of the reasoning underlying an agent's choices.
Decision theory can be broken into two branches:
· normative decision theory, which gives advice on how to make the best decisions, given a set of uncertain beliefs and a set of values; and
· descriptive decision theory, which analyzes how existing, possibly irrational agents actually make decisions.
Empirical applications of this theory are usually done with the help of statistical and econometric methods, especially via the so-called choice models, such as probit and logit models.
Advocates for the use of probability theory point to the work of Richard Threlkeld Cox, Bruno de Finetti, and complete class theorems, which relate rules to Bayesian procedures
Others maintain that probability is only one of
many possible approaches to making choices, such as fuzzy logic, possibility
theory, quantum
cognition, Dempster–Shafer theory and info-gap decision theory.
And point to examples where alternative approaches have been implemented with apparent success.” Wikipedia 31.12/2018.
Decision theory is beyond the scope of this work on system theory.
The Wikipedia entry on Decision Theory will give you other links to follow.
For some practical case studies, look here http://www.attwaterconsulting.com/Papers.htm
They feature (for example) the use of a Bayesian approach with Markov Chain Monte Carlo numerical methods.
The applications include assessing the risks of mechanical system failures, in order to inform decisions about their use and maintenance.
Be cautious about claims made about mathematics-based decision making.
First, the comparison is not between making a decision and making no decision.
It is between making a decision by mathematical analysis and making a more intuitive or experience-based decision.
Second, mathematics-based decision making cannot be extended to that large set of business decisions where
· the time or cost of the analysis is too high
· one can make only wild guesses about the raw data/numbers
That last is the category of decision that top level managers are often faced with, and paid to make.
In the theory of evolution by natural selection, can a social group be treated as an organism?
Can selection between groups (favoring cooperation) successfully oppose selection within a group (by competition)?
Thinkers who addressed this include:
· Lynn Margulis – the evolution of cells, organisms and societies
· Boehm – the evolution of hunter-gatherer groups
· Elinor Ostrom – the formation of cooperatives.
Lynn Margulis (1970) proposed how nucleated cells evolved from symbiotic associations of bacteria.
The general idea is that members of groups can become so cooperative that the group becomes a higher-level organism in its own right.
The idea was later generalized (Maynard Smith and Szathmary 1995, 1999) to explain other major transitions, such as the rise of
· multicellular organisms
· eusocial insect colonies
· human evolution.
Hunter-gatherer societies are famously egalitarian, but not because everyone is nice.
Group members can collectively suppress bullying and other self-aggrandizing behaviors within their ranks.
Boehm (1993, 1999, 2011) saw this as the defining criterion of a major evolutionary transition in human society.
With little disruptive competition within a group, succeeding as a group became the main selective force in human evolution.
Consider a group of people who share access to resources.
Such as fishermen who share fishing grounds, or farmers who share an irrigation system.
How to
avoid “the tragedy of the commons” by which competition exhausts the common
resource?
For a while, the fishermen must stop fishing, and farmers stop farming, to define the rules of their social system – a cooperative.
Elinor Ostrom (1990, 2010) defined eight generic conditions for such a cooperative.
|
1 Clearly defined boundaries |
members know they are members of a group
and it aims |
|
2
Proportional equivalence between benefits and costs |
members
must earn benefits and can’t just appropriate them |
|
3
Collective choice arrangements |
members
must agree decisions so nobody can be bossed around |
|
4
Monitoring 5
Graduated sanctions 6
Fast and fair conflict resolution |
disruptive
self-serving behaviors must be detected and
punished |
|
7
Local autonomy |
the
group must have the elbow room to manage its own affairs |
|
8
Appropriate relations with other rule-making authorities (polycentric
governance) |
all
rules above apply equally to inter-group relations |
David Wilson reports projects that successfully applied Ostrom’s eight principles
However, there are two constraints on how widely applicable they are.
First, the eight conditions are very demanding.
Second, the natural pre-modern grouping of humans by geographical location has largely broken down.
In
our modern interconnected world: what is a social group?
Can
it be virtual instead of face-to-face?
How
does an individual actor join or leave a group? Who decides?
How
many groups can one individual be a member of? Are there degrees of membership?
How
does an actor prioritise, apportion time and attention, between groups they
belong to?
How do the reconcile the conflicting norms or goals of different goals?
This section above was edited from this paper http://evonomics.com/tragedy-of-the-commons-elinor-ostrom
by David
Sloan Wilson.
Read that paper for more detail and references.
Second-order cybernetics was developed around 1970 by thinkers including Heinz von Foerster and Margaret Mead.
The distinction between classical and second-order cybernetics is fundamental.
Classical
cybernetics emerged out of thinking about biological and mechanical control
systems.
A system responds in a regular way to changes in its environment or another (coupled) system.
The term adaptation usually means system state change - changing state variable values in response to events.
It often means homeostasis -
maintaining given variable
values in a desirable
range.
Homeostasis maintains the nature of a
system.
The term evolution might be be used to mean the path followed by state variable values over time.
The trajectory of state change (be it linear, circular or chaotic) is an inexorable result of the system’s rules.
Second-order cybernetics emerged out of thinking about social organisations.
The term adaptation often means system mutation - or evolution - changing state variable types or the rules for responding to events.
This changes the very nature of the
system; it changes its laws.
Moreover, second order cybernetics is the recursive application of cybernetics to itself.
It allows systems actors to be system thinkers, who study the system they play roles in, and re-organise it.
The trouble is that continual
reorganisation undermines the general concept of a system – which is
regularity.
Consequently, second-order cybernetics and “complexity science” tend to undermine more general system theory.
Read second order cybernetics for more.
There is probably little dispute about these basic ideas about systems.
· There are forms and functions – actors and activities - in a system.
· There are accidental and purposive - natural and designed - systems.
· There are descriptions and realisations - abstract and concrete - systems.
Activity systems can be seen as games in which actors follow defined roles and rules.
You rely on countless human activity systems.
You wouldn't want to:
· stand trial in a court that didn’t follow court procedures
· board a train or airplane operated by people who didn’t follow the rules.
· invest in a company that didn’t repay its loans as promised
· play tennis against somebody who ignored the laws of the game.
Unfortunately, second-order cybernetics and “complexity science” have undermined the concept of a system.
Some sociologists have come to call any social network a system, even where there are no defined roles or rules.
And may neglect to consider that one human actor can belong to different social networks and play roles in different systems.
To call every problem, situation, society or social group “a system” is unhelpful.
A business system has roles and rules, which are defined and coordinated to meet agreed business aims.
Employees frequently act outside of defined roles – whether to benefit or the cost of a business.
But those extra mural actions are not part of the business system in any meaningful sense.
The following papers unscramble ways that the ideas in this table have been confused.
|
A social network |
A social system |
|
A set of actors who
communicate as they choose. |
A set of
activities performed by actors. |
|
A concrete entity
in the real world. |
A performance of
abstract roles and rules by actors in social network |
|
Ever-changing at
the whim of the actors |
Described and
changed under change control |
Read Systems thinking approaches for more.
Social systems thinking continued alongside the post-war system theory movement, sometimes in touch with it, sometimes far apart from it.
Niklas Luhmann (1927–1998) was a German sociologist and student of Parsons.
Like writers a century earlier, he presumed a system is homeostatic and sustains itself, though in
a very curious way.
David Seidl (2001) said the question facing a social system theorist is what to treat as the basic elements of a social system.
“The sociological tradition
suggests two alternatives: either persons or actions.”
Luhmann chose neither,
he proposed the basic elements of a social system are communicative events about
a code that lead to decisions that sustain the system.
Each social system is centred on one code, which is a concept such as “justice” or “sheep shearing”.
He endorsed the “hermeneutic principle” that the hearer
alone determines the meaning of a communicative event.
Read Luhmann’s ideas for more.
|
Observations: Luhmann’s system is radically different from systems as understood by most other
system theorists. It is well-nigh
diametrically opposed to that of classical cybernetics. Since the system
has no persistent structure, no persistent state, and no memory of
communication events. And the hermeneutic principle is contrary to common sense and to
biology. Since communication requires a receiver to decode the same meaning
from a message that a sender intentionally encoded in that message. Luhmann’s whole scheme (like that of Parsons before
him) seems more metaphysical than scientific. However, the idea of system based on a code might been seen as having
a counterpart in more general system theory That is a “domain-specific language” for communication of information
about entities and events related to one body of knowledge. |
Jürgen Habermas (born 1929) was a critic of Luhmann’s theory of social systems
He developed the social theory of communicative reason or communicative rationality.
According to Wikipedia, this distinguishes itself from the rationalist tradition, by locating rationality in structures of interpersonal linguistic communication rather than in the structure of the cosmos.
It rests on the argument called universal pragmatics – that all speech acts have an inherent "purpose" – the goal of mutual understanding.
He presumed human beings possess the communicative competence to bring about such understanding.
And hoped that coming to terms with how people understand or misunderstand one another could lead to a reduction of social conflict.
|
Observations: A theory of why
and how animate entities communicate has to start from the evolutionary
advantage it gives them. Natural human language
is inherently fluid and fuzzy; it is a tool for social bonding and
communication, but can easily lead to misunderstandings. |
The tendency of “systems thinkers” to draw analogies between “systems” in different sciences is not itself science.
Consider how very different are the systems in this (possibly questionable) table
|
A software system |
A free market economic system |
|
Is a designed
entity. |
Is a natural
entity. |
|
Must be described
fully, in excruciating detail. |
Can be described
lightly as a collection of actors making buy and sell decisions. |
|
Must be tested to
ensure its actions add up to coherent, consistent and correct whole. |
Needs no testing
before it runs. |
|
Proceeds by
actions that are predetermined and coordinated. |
Proceeds by
actions that are neither predetermined nor coordinated. |
|
Proceeds only
when intentionally deployed and set in motion. |
Proceeds
regardless of any overarching intention. |
|
Changes only by design
of actors outside the system |
Changes as a
result of actors inside the system. |
|
Changes only
incrementally and predictably. |
Evolves
continually and unpredictably. |
|
Is relatively
complex |
Is relatively simple
(however complex the real world actors and activities are). |
And consider how very different are the systems in this (possibly questionable) table..
|
The actors in an agile software
development system |
The actors in a free market economic
system |
|
The actors are a
small team of developers (cf. a hunter-gatherer group) |
Actors are
millions of individuals who act in their own self interest |
|
Actors act to
build a coherent, consistent and correct software system |
Actors act to sell
or buy something (anything). |
|
Actors must make
coordinated decisions. |
Actors make ad
hoc decisions. |
|
Actors make
decisions with the purposes of the system’s owners and users in mind. |
Actors make
decisions no wider purposes in mind. |
|
Actors’ decisions
are highly constrained by requirements technologies, standards etc. |
Actors’ decisions
are constrained by the money they possess. |
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