“A complex system that works is invariably found to have evolved from a simple system that worked. The inverse proposition also appears to be true: A complex system designed from scratch never works and cannot be made to work. You have to start over, beginning with a working simple system.”

—  John Gall

Source: General systemantics, an essay on how systems work, and especially how they fail..., 1975, p. 71. This statement is known as Gall's law

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John Gall 13
American physician 1925–2014

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“A complex system that works is invariably found to have evolved from a simple system that worked. A complex system designed from scratch never works and cannot be patched up to make it work. You have to start over, beginning with a working simple system.”

John Gall (1925–2014) American physician

Source: General systemantics, an essay on how systems work, and especially how they fail..., 1975, p. 65, cited in: Grady Booch (1991) Object oriented design with applications. p. 11

Kevin Kelly photo

“Complexity must be grown from simple systems that already work.”

Kevin Kelly (1952) American author and editor

Out of Control: The New Biology of Machines, Social Systems and the Economic World (1995)

“But how does it come about, step by step, that some complex Systems actually function? This question, to which we as students of General Systemantics attach the highest importance, has not yet yielded to intensive modern methods of investigation and analysis. As of this writing, only a limited and partial breakthrough can be reported, as follows: A COMPLEX SYSTEM THAT WORKS IS INVARIABLY FOUND TO HAVE EVOLVED FROM A SIMPLE SYSTEM THAT WORKED”

John Gall (1925–2014) American physician

Source: Systemantics: the underground text of systems lore, 1986, p. 65 cited in "Quotes from Systemantics – Funny, But Scary Too" Posted on agileadvice.com March 3, 2006 by Mishkin Berteig. This quote was mentioned in General systemantics (1975, p. 71)

Ai Weiwei photo

“I want to prove that the system is not working..... You can’t simply say that the system is not working. You have to work through it”

Ai Weiwei (1957) Chinese concept artist

Osnos, Evan. “ It’s Not Beautiful: An Artist Takes On the System http://www.newyorker.com/reporting/2010/05/24/100524fa_fact_osnos?currentPage=all.” New Yorker, May 24, 2010, 54–63.
2010-, 2010

“There is no over-arching theory of complexity that allows us to ignore the contingent aspects of complex systems. If something really is complex, it cannot by adequately described by means of a simple theory. Engaging with complexity entails engaging with specific complex systems. Despite this we can, at a very basic level, make general remarks concerning the conditions for complex behaviour and the dynamics of complex systems. Furthermore, I suggest that complex systems can be modelled.”

Paul Cilliers (1956–2011) South African philosopher

Source: Complexity and Postmodernism (1998), p. ix

“The classification of a system as complex or simple will depend upon the observer of the system and upon the purpose he has for considering the system.”

Mike Jackson (1951) systems scientist

As cited in: Joseph E. Kasser (2010) " Seven systems engineering myths and the corresponding realities http://www.synergio.nl/media/59286/7_myths_of_se.pdf"
Towards a System of Systems Methodologies (1984)

Ward Cunningham photo

“Over and over, people try to design systems that make tomorrow's work easy. But when tomorrow comes it turns out they didn't quite understand tomorrow's work, and they actually made it harder.”

Ward Cunningham (1949) American computer programmer who developed the first wiki

A Conversation with Ward Cunningham (2003), Working the Program

“The objective of the Computer-Aided Design Project is to evolve a machine systems which will permit the human designer and the computer to work together on creative design problems.”

Douglas T. Ross (1929–2007) American computer scientist

Source: Computer-Aided Design: A Statement of Objectives (1960), p. iii: Abstract.

“In complex systems cause and effect are often not closely related in either time or space. The structure of a complex system is not a simple feedback loop where one system state dominates the behavior. The complex system has a multiplicity of interacting feedback loops. Its internal rates of flow are controlled by nonlinear relationships. The complex system is of high order, meaning that there are many system states (or levels). It usually contains positive-feedback loops describing growth processes as well as negative, goal-seeking loops. In the complex system the cause of a difficulty may lie far back in time from the symptoms, or in a completely different and remote part of the system. In fact, causes are usually found, not in prior events, but in the structure and policies of the system.”

Jay Wright Forrester (1918–2016) American operations researcher

Source: Urban dynamics (1969), p. 9

A. Wayne Wymore photo

“[In the year 1957] I have just returned from an exciting meeting of the American Society for Engineering Education where I heard a paper on the new discipline of systems engineering. It is no longer sufficient for engineers merely to design boxes such as computers with the expectation that they would become components of larger, more complex systems. That is wasteful because frequently the box component is a bad fit in the system and has to be redesigned or worse, can lead to system failure. We must learn how to design large-scale, complex systems from the top down so that the specification for each component is derivable from the requirements for the overall system. We must also take a much larger view of systems. We must design the man-machine interfaces and even the system-society interfaces. Systems engineers must be trained for the design of large-scale, complex, man-machine-social systems.”

A. Wayne Wymore (1927–2011) American mathematician

Systems Movement: Autobiographical Retrospectives (2004)

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