“Synthesis of systems is much more difficult. Here science and engineering begin to take on aspects of art. A systems designer or planner not only must construct systems that work harmoniously individually and in tandem, he must also know a lot about the environment that the system is intended to match. Consideration of environmental factors requires foresight and experience; no one can ever foresee all the variables of importance and a choice of which to include is often a difficult one to make.”

— Arthur D. Hall

Source: Definition of System, 1956, p. 28

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Arthur D. Hall 18

American electrical engineer 1925–2006

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“[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)

“The management system of an organization must have compatible component parts if it is to function effectively. This conclusion has a very important implication; experiments in organizations must involve internally consistent changes. The traditional atomistic research design is not appropriate for experiments involving organizational theory or management systems. Every aspect of a management system is related to every other part and interacts with it.
The results obtained by altering a single variable or procedure while keeping all others the same usually will yield quite different results from those obtained when that variable is changed along with simultaneous and compatible changes in all other aspects of the management system. The true influence of altering one aspect of the system cannot be determined by varying it and it alone… In experiments involving organizational theory and management systems, therefore, a systems approach must be used. The organic integrity of each system must be maintained while experimental variations are being made.”

Rensis Likert (1903–1981) American statistician

Source: The Human Organization, 1967, p. 123

“It is hard to say whether increasing complexity is the cause or the effect of man's effort to cope with his expanding environment. In either case a central feature of the trend has been the development of large and very complex systems which tie together modern society. These systems include abstract or non-physical systems, such as government and the economic system. They also include large physical systems like pipe line and power distribution systems, transportation and electrical communication systems. The growth of these systems has increased the need not only for over-all planning, but also for long-range development of the systems. This need has induced increased interest in the methods by which efficient planning and design can be accomplished in complex situations where no one scientific discipline can account for all the factors. Two similar disciplines which emerged about the time of World War II to cope with these problems are called systems engineering and operations research.”

Arthur D. Hall (1925–2006) American electrical engineer

Source: A methodology for systems engineering, 1962, p. 5: About the evolution of systems engineering; Partly cited in: Allen B. Rosenstein (1965) " Systems engineering and Modern Engineering Design http://books.google.com/books?id=HDp9ReqM314C&pg=PA1#v=onepage&q&f=false"

“Only if mathematical rigor is adhered to, can systems problems be dealt with effectively, and so it is that the systems engineer must, at least, develop an appreciation for mathematical rigor if not also considerable mathematical competence.”

A. Wayne Wymore (1927–2011) American mathematician

Source: A Mathematical Theory of Systems Engineering (1967), p. 3.

“A. D. Hall's (1962) classic account of the methodology was based on his experience with the Bell Telephone Laboratories. Hall sees systems as existing in hierarchies. In systems engineering, plans to achieve a general objective must similarly be arranged in a hierarchy, with the systems engineer ensuring the internal consistency and integration of the plans, The methodology itself ensures the optimization of the system of concern with respect to its objectives. This requires a number of steps, the most important being problem definition, choosing objectives, systems synthesis, systems analysis, systems selection, system development, and current engineering. With Hall, the system of concern is usually a physical entity.”

Mike Jackson (1951) systems scientist

Michael C. Jackson (1992) Systems Methodology for the Management Sciences. p. 74; About A.D. Hall (1962)

“In the minds of many writers systems engineering is synonomous with component selection and interface design; that is, the systems engineer does not design hardware but decides what types of existing hardware shall be coupled and how they shall be coupled. Complete agreement that this function is the essence of systems engineering will not be found here, for, besides the very important function of systems engineering in systems analysis, there is the role played by systems engineering in providing boundary conditions for hardware design.”

A. Wayne Wymore (1927–2011) American mathematician

Source: A Mathematical Theory of Systems Engineering (1967), p. 193.

“In general, we can say that the larger the system becomes, the more the parts interact, the more difficult it is to understand environmental constraints, the more obscure becomes the problem of what resources should be made available, and deepest of all, the more difficult becomes the problem of the legitimate values of the system.”

C. West Churchman (1913–2004) American philosopher and systems scientist

Source: 1960s - 1970s, The Systems Approach (1968), p. 77; cited in John Gall (1978) Systemantics; how systems work... and especially how they fail

“Systems science and technology constitute one aspect of systems thinking, but the humanities and arts make up the other. The fact that design plays such a large part in the systemic treatment of problems makes it apparent that art has a major role in it as well. Ethics and aesthetics are integral aspects of evaluating systems… the systems approach involves the pursuit of truth (science) and its effective use (technology), plenty (economics), the good (ethics and morality), and beauty and fun (aesthetics). To compare systems methodology with that of any of the so-called ‘hard’ disciplines—for example, physics—is to misunderstand the nature of systems. The worry is not that the systems approach is not scientific in the sense which physics or chemistry or biology is, but that some try to make it scientific in that sense. To the extent they succeed, they destroy it.”

Russell L. Ackoff (1919–2009) Scientist

Ackoff (1999). "Disciplines, the two cultures and the scianities". Systems Research and Behavioral Science. 16 (6), p. 537. Cited in: Sherryl Stalinski (2005) A Systems View of Social Systems, Culture and Communities. Saybrook Graduate School. p. 5.
1990s

“System engineering is the art and science of creating effective systems, using whole system, whole life principles.”

Derek Hitchins (1935) British systems engineer

Derek Hitchins (1995) cited in: Herbert Negele (2000) Systems engineering--a key to competitive advantage for all industries. p,166

“What is a system? A system is a network of interdependent components that work together to try to accomplish the aim of the system. A system must have an aim. Without an aim, there is no system. The aim of the system must be clear to everyone in the system. The aim must include plans for the future. The aim is a value judgment.”

W. Edwards Deming (1900–1993) American professor, author, and consultant

We are of course talking here about a man-made system.
The New Economics for Industry, Government, Education (1993)

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