“The plan of the present paper is to discuss properties of systems more or less abstractly; that is to define system and to describe the properties that are common to many systems and which serve to characterize them all.”

—  Arthur D. Hall

Source: Definition of System, 1956, p. 18: Introduction

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Arthur D. Hall photo
Arthur D. Hall 18
American electrical engineer 1925–2006

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“By a state of a system is meant any well-defined condition or property that can be recognised if it occurs again. Every system will naturally have many possible states.”

W. Ross Ashby (1903–1972) British psychiatrist

Source: An Introduction to Cybernetics (1956), Part I: Mechanism, p. 25

Herbert A. Simon photo

“A number of proposals have been advanced in recent years for the development of ‘general systems theory’ which, abstracting from properties peculiar to physical, biological, or social systems, would be applicable to all of them. We might well feel that, while the goal is laudable, systems of such diverse kinds could hardly be expected to have any nontrivial properties in common. Metaphor and analogy can be helpful, or they can be misleading. All depends on whether the similarities the metaphor captures are significant or superficial.
It may not be entirely vain, however, to search for common properties among diverse kinds of complex systems… The ideas of feedback and information provide a frame of reference for viewing a wide range of situations, just as do the ideas of evolution, of relativism, of axiomatic method, and of operationalism… hierarchic systems have some common properties that are independent of their specific content…”

Herbert A. Simon (1916–2001) American political scientist, economist, sociologist, and psychologist

H.A. Simon (1962) "The Architecture of complexity." in: Proceedings of the American Philosophical Society. Vol 106, pp. 467-468. as cited in: "James Grier Miller (1916-)" at isss.org retrieved Nov 16, 2012.
1960s-1970s

“The term system has a number of meanings. There are systems of numbers and of equations, systems of value and of thought, systems of law, solar systems, organic systems, management systems, command and control systems, electronic systems, even the Union Pacific Railroad system. The meanings of "system" are often confused. The most general, however, is: A system is a set of interacting units with relationships among them. The word "set" implies that the units have some common properties. These common properties are essential if the units are to interact or have relationships. The state of each unit is constrained by, conditioned by, or dependent on the state of other units. The units are coupled. Moreover, there is at least one measure of the sum of its units which is larger than the sum of that measure of its units.”

James Grier Miller (1916–2002) biologist

Source: Living systems, 1978, p. 16; As cited in: Sven Rasegård (2002) Man and Science: A Web of Systems and Social Conventions. p. 29

“There appears to exist a general systems laws which apply to any system of a certain type, irrespective of the particular properties of the system and of the elements involved.”

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

Source: General System Theory (1968), 2. The Meaning of General Systems Theory, p. 37

“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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“[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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“"Correct" is a property of small systems.”

Kevin Kelly (1952) American author and editor

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

Russell L. Ackoff photo

“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

“For a long time, people have been trying to characterize or define the notion of system. After all, “systems” are supposed to be what System Theory is about. The results so far have been contradictory and unsatisfactory. This confusion at the foundations has led many to conclude that there is no such thing as a "system" and hence to deny that System Theory is about anything. Even those most sympathetic to the notion have difficulties at this level. The very founders of System Theory did not try to say what a system was; and as for System Theory, they characterized it only obliquely, by saying it comprised all studies of interest to more than one discipline. They thereby begged the entire question.”

Robert Rosen (1934–1998) American theoretical biologist

Source: "Some comments on systems and system theory," (1986), p. 1

“General systems theory (in the narrow sense of the term) is a discipline concerned with the general properties and laws of “systems”. A system is defined as a complex of components in interaction, or by some similar proposition. Systems theory tries to develop those principles that apply to systems in general, irrespective of the nature of the system, of their components, and of the relations or “forces” between them. The system components need not even be material, as, for example, in the system analysis of a commercial enterprise where components such as buildings, machines, personnel, money and “good will” of customers enter.”

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

Source: 1960s, Robots, Men and Minds (1967), p. 69

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