“From the physical point of view the characteristic state of the living organism is that of an open system. A system is closed if no material enters or leaves it; it is open if there is import and export and, therefore, change of the components. Living systems are open systems, maintaining themselves in exchange of materials with environment, and in continuous building up and breaking down of their components.”

—  Ludwig von Bertalanffy

Von Bertalanffy (1950) &quot; The Theory of Open Systems in Physics and Biology http://vhpark.hyperbody.nl/images/a/aa/Bertalanffy-The_Theory_of_Open_Systems_in_Physics_and_Biology.pdf&quot; In: Science, January 13, 1950, Vol. 111. p. 23 <br class="br">1950s

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Ludwig von Bertalanffy65
austrian biologist and philosopher 1901–1972

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“Conventional physics deals only with closed systems, i. e. systems which are considered to be isolated from their environment… However, we find systems which by their very nature and definition are not closed systems. Every living organism is essentially an open system. It maintains itself in a continuous inflow and outflow, a building up and breaking down of components, never being, so long as it is alive, in a state of chemical and thermodynamic equilibrium but maintained in a so-called steady state which is distinct from the latter.”

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

Source: General System Theory (1968), 7. Some Aspects of System Theory in Biology, p. 166-167 as quoted in: Eugene Thacker (2004) Biomedia. University of Minnesota Press. p. 150

“We find systems which by their very nature and definition are not closed systems. Every living organism is essentially an open system. It maintains itself in a continuous inflow and outflow, a building up and breaking down of components, never being, so long as it is alive, in a state of chemical and thermodynamic equilibrium but maintained in a so-called steady state which is distinct from the latter.”

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

Source: General System Theory (1968), 2. The Meaning of General Systems Theory, p. 39

“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

Michael Halliday photo

“A physical system is just that: a physical system. What is systematized is matter itself, and the processes in which the system is realized are also material. But a biological system is more complex: it is both biological and physical — it is matter with the added component of life; and a social system is more complex still: it is physical, and biological, with the added component of social order, or value. … A semiotic system is still one step further in complexity: it is physical, and biological, and social —and also semiotic: what is being systematized is meaning. In evolutionary terms, it is a system of the fourth order of complexity”

Michael Halliday (1925–2018) Australian linguist

Michael Halliday (2005, p. 68) as cited in: Andrew Halliday and Marion Glaser (2011) "A Management Perspective on Social Ecological Systems". In: Human Ecology Review, Vol. 18, No. 1, 2011.
1970s and later

“It's not as though we can expect that next year or a decade from now someone will find the correct systems approach and all deception will disappear. This, in my opinion, is not in the nature of systems. What is in the nature of systems is a continuing perception and deception, a continuing re-viewing of the world, of the whole system, and of its components. The essence of the systems approach, therefore, is confusion as well as enlightenment. The two are inseparable aspects of human living.”

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

Source: 1960s - 1970s, The Systems Approach (1968), p. 231; cited in Charles Smith (2007, p. 44)

“That a system is open means, not simply that it engages in interchanges with the environment, but that this interchange is an essential factor underlying the system's viability, its reproductive ability or continuity, and its ability to change.”

Walter F. Buckley (1922–2006) American sociologist

Source: Sociology and modern systems theory (1967), p. 50.

Kevin Kelly photo

“Every time a closed system opens, it begins to interact more directly with other existing systems, and therefore acquires all the value of those systems.”

Kevin Kelly (1952) American author and editor

Out of Control: The New Biology of Machines, Social Systems and the Economic World (1995), New Rules for the New Economy: 10 Radical Strategies for a Connected World (1999)

“A great deal of the thinking here has been influenced by cybernetics and information theory, though this has been used as much to extend the scope of closed-system as to improve the sophistication of open system formulations. It was von Bertalanffy (1950) who, in terms of the general transport equation which he introduced, first fully disclosed the importance of openness or closedness to the environment as a means of distinguishing living organisms from inanimate objects.”

Fred Emery (1925–1997) Australian psychologist

Source: The Causal Texture of Organizational Environments (1963), p. 22.

“An organization is a subordinate system of a specific larger system, the cooperative system, whose components are physical, biological, and personal systems. The relations with other organizations… are outside this specific cooperative system. Other organizations are a part of the social environment of the organization. It is for this reason I have used the phrase "complex of organizations" rather than "system." Usually the most significant relationships of a unit organization are those with the specific cooperative system of which it is a part. It is this system which primarily and on the whole in most instances determines the chief conditions of the organization's existence.”

Chester Barnard book The Functions of the Executive

Source: The Functions of the Executive (1938), p. 98-99, footnote

“General systems theory is a series of related definitions, assumptions, and postulates about all levels of systems from atomic particles through atoms, molecules, crystals, viruses, cells, organs, individuals, small groups, societies, planets, solar systems, and galaxies. General behavior systems theory is a subcategory of such theory, dealing with living systems, extending roughly from viruses through societies. A significant fact about living things is that they are open systems, with important inputs and outputs. Laws which apply to them differ from those applying to relatively closed systems.”

James Grier Miller (1916–2002) biologist

Miller (1956) "General behavior systems theory and summary". In: Journal of Counseling Psychology. 3 (2) 120-124. Cited in: Francis Ferguson (1975) Architecture, cities and the systems approach. p. 12

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