“A system may actually exist as a natural aggregation of component parts found in Nature, or it may be a man-contrived aggregation – a way of looking at a problem which results from a deliberate decision to assume that a set of elements are related and constitute such a thing called ‘a system.”

—  C. West Churchman

C. West Churchman, , I. Auerbach, and Simcha Sadam (1975) Thinking for Decisions Deduction Quantitative Methods. Science Research Associates. cited in: John P. van Gigch (1978) Applied General Systems Theory. Harper & Row Publishers
1960s - 1970s

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C. West Churchman 64
American philosopher and systems scientist 1913–2004

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“Let us begin by observing that the word "system" is almost never used by itself; it is generally accompanied by an adjective or other modifier: physical system; biological system; social system; economic system; axiom system; religious system; and even "general" system. This usage suggests that, when confronted by a system of any kind, certain of its properties are to be subsumed under the adjective, and other properties are subsumed under the "system," while still others may depend essentially on both. The adjective describes what is special or particular; i. e., it refers to the specific "thinghood" of the system; the "system" describes those properties which are independent of this specific "thinghood."
This observation immediately suggests a close parallel between the concept of a system and the development of the mathematical concept of a set. Given any specific aggregate of things; e. g., five oranges, three sticks, five fingers, there are some properties of the aggregate which depend on the specific nature of the things of which the aggregate is composed. There are others which are totally independent of this and depend only on the "set-ness" of the aggregate. The most prominent of these is what we can call the cardinality of the aggregate…
It should now be clear that system hood is related to thinghood in much the same way as set-ness is related to thinghood. Likewise, what we generally call system properties are related to systemhood in the same way as cardinality is related to set-ness. But systemhood is different from both set-ness and from thinghood; it is an independent category.”

Robert Rosen (1934–1998) American theoretical biologist

Source: "Some comments on systems and system theory," (1986), p. 1-2 as quoted in George Klir (2001) Facets of Systems Science, p. 4

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“A system in one perspective is a subsystem in another. But the systems view always treats systems as integrated wholes of their subsidiary components and never as the mechanistic aggregate of parts in isolable causal relations.”

Ervin László (1932) Hungarian musician and philosopher

Source: Introduction to Systems Philosophy (1972), p. 14.

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“Synergy means behavior of integral, aggregate, whole systems unpredicted by behaviors of any of their components or subassemblies of their components taken separately from the whole.”

Buckminster Fuller (1895–1983) American architect, systems theorist, author, designer, inventor and futurist

102.00 http://www.rwgrayprojects.com/synergetics/s01/p0100.html
1970s, Synergetics: Explorations in the Geometry of Thinking (1975), "Synergy" onwards

“In considerations involving the nature of the world as a whole the irregularities caused by the aggregation of matter into stars and stellar systems may be ignored; and if we further assume that the total matter in the world has but little effect on its macroscopic properties, we may consider them as being determined by the solution of an empty world.”

Howard P. Robertson (1903–1961) American mathematician and physicist

"On Relativistic Cosmology" (1928)

“The notion of system we are interested in may be described generally as a complex of elements or components directly or indirectly related in a network of interrelationships of various kinds, such that it constitutes a dynamic whole with emergent properties.”

Walter F. Buckley (1922–2006) American sociologist

Source: Society: A Complex Adaptive System--Essays in Social Theory, (1998), p. 35 as cited in: Kenneth D. Bailey (2006) A Typology of Emergence in Social Systems and Sociocybernetic Theory http://www.unizar.es/sociocybernetics/congresos/DURBAN/papers/bailey.pdf.

“Thus, there exist models, principles, and laws that apply to generalized systems or their subclasses, irrespective of their particular kind, the nature of their component elements, and the relations or „forces‟ between them. It seems legitimate to ask for a theory, not of systems of a more or less special kind, but of universal principles applying to systems in general. In this way, we postulate a new discipline called General Systems Theory. Its subject matter is the formulation and derivation of those principles, which are valid for „systems‟ in general.”

Ludwig von Bertalanffy (1901–1972) austrian biologist and philosopher

Source: General System Theory (1968), 2. The Meaning of General Systems Theory, p. 32

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“There are progressive degrees of synergy, called synergy-of-synergies, which are complexes of behavior aggregates holistically unpredicted by the separate behaviors of any of their subcomplex components. Any subcomplex aggregate is only a component aggregation of an even greater event aggregation whose comprehensive behaviors are never predicted by the component aggregates alone. There is a synergetic progression in Universe—a hierarchy of total complex behaviors entirely unpredicted by their successive subcomplexes' behaviors. It is manifest that Universe is the maximum synergy-of-synergies, being utterly unpredicted by any of its parts.”

Buckminster Fuller (1895–1983) American architect, systems theorist, author, designer, inventor and futurist

150.01 http://www.rwgrayprojects.com/synergetics/s01/p5000.html
1970s, Synergetics: Explorations in the Geometry of Thinking (1975), "Synergy" onwards

“Newton achieved the clearest appreciation of the relation between the empirical elements in a scientific system and the hypothetical elements derived from a philosophy of nature.”

Alistair Cameron Crombie (1915–1996) Australian zoologist, historian of science

Alistair Cameron Crombie, as quoted by John Freely in Before Galileo; The Birth of Modern Science in Medieval Europe http://books.google.com/books?id=MfhjAAAAQBAJ (2012).

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“[The environment of a system is] a set of elements and their relevant properties, which elements are not part of the system, but a change in any of which can cause or produce a change in the state of the system.”

Russell L. Ackoff (1919–2009) Scientist

1970s, Towards a System of Systems Concepts, 1971

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“A system is more than the sum of its parts; it is an indivisible whole. It loses its essential properties when it is taken apart. The elements of a system may themselves be systems, and every system may be part of a larger system.”

Russell L. Ackoff (1919–2009) Scientist

Ackoff (1973) "Science in the Systems Age: beyond IE, OR and MS." in: Operations Research Vol 21, pp. 664.
1970s

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