“Living systems are units of interactions; they exist in an ambience. From a purely biological point of view they cannot be understood independently of that part of the ambience with which they interact: the niche; nor can the niche be defined independently of the living system that specifies it.”

— Humberto Maturana

Source: Biology of Cognition (1970), p. 9.

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Humberto Maturana 14

Chilean biologist and philosopher 1928

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“The linguistic domain as a domain of orienting behavior requires at least two interacting organisms with comparable domains of interactions, so that a cooperative system of consensual interactions may be developed in which the emerging conduct of the two organisms is relevant for both. The specifiability through learning of the orienting interactions allows for a purely consensual (cultural) evolution in this domain, without it necessarily involving any further evolution of the nervous system; for this reason the linguistic domain in general, and the domain of self-consciousness in particular, are, in principle, independent of the biological substratum that generates them.”

Humberto Maturana (1928) Chilean biologist and philosopher

Source: Biology of Cognition (1970), p. 43.

“The world about us can be looked at in a variety of ways. One way is to see the world as made up from many interacting systems: weather, societal, economic, ecological, floral, faunal, tectonic plate, oceanic, and so on. This is very much a connected view of the world: nothing is isolated and totally independent; everything is part of something bigger, and everything comprises many interacting parts — subsystems.”

Derek Hitchins (1935) British systems engineer

Derek Hitchins (2013) at " Systems World http://www.hitchins.net/" at hitchins.net

“The universe of all things that exist may be understood as a universe of systems where a system is defined as any set of related and interacting elements. This concept is primitive and powerful and has been used increasingly over the last half-century to organize knowledge in virtually all domains of interest to investigators. As human inventions and social interactions grow more complex, general conceptual frameworks that integrate knowledge among different disciplines studying those emerging systems grow more important. Living systems theory (LST) instructs integrative research among biological and social sciences and related academic disciplines.”

James Grier Miller (1916–2002) biologist

G. A. Swanson and James Grier Miller (2013) " Living Systems Theory http://www.eolss.net/Sample-Chapters/C02/E6-46-01-03.pdf" in Systems Science and Cybernetics. Vol I.

“The systems approach to problems focuses on systems taken as a whole, not on their parts taken separately. Such an approach is concerned with total- system performance even when a change in only one or a few of its parts is contemplated because there are some properties of systems that can only be treated adequately from a holistic point of view. These properties derive from the relationship between parts of systems: how the parts interact and fit together”

Russell L. Ackoff (1919–2009) Scientist

Cited in: Haluk Demirkan, James C. Spohrer, Vikas Krishna (2011) The Science of Service Systems. p. 274.
1970s, Towards a System of Systems Concepts, 1971

“A system is an open set of complementary, interacting parts, with properties, capabilities and behaviours of the set emerging both from the parts and from their interactions to synthesize a unified whole.”

Derek Hitchins (1935) British systems engineer

Hitchins (1998. p. 195) cited in: Peter Stasinopoulos (2009) Whole System Design: An Integrated Approach to Sustainable Engineering. p. 27

“The observing mind is not a physical system, it cannot interact with any physical system.”

Erwin Schrödinger (1887–1961) Austrian physicist

Nature and the Greeks (1954)
Context: The observing mind is not a physical system, it cannot interact with any physical system. And it might be better to reserve the term "subject" for the observing mind. … For the subject, if anything, is the thing that senses and thinks. Sensations and thoughts do not belong to the "world of energy."

“The point of departure is the measurement problem, as it appears in physics; the manner in which measurements allow us to characterize subsystems; the role of such subsystems as tools in system analysis; and the relationships existing between different ways of perceiving or interacting with the same system. Our conclusions are: (1) there exists no universal family of of analytic units appropriate for the treatment of all interactions; (2) there are on the contrary many such families of analytic units, all of which are equally “real” and entitled to be treated on the same footing; (3) the appropriate use of natural interactions can enormously extend the class of physical observables accessible to us; (4) the concept of a model must be formulated, in its most general terms, as the sharing of a subsystem by two otherwise distinct systems, capable of imposing the same dynamic on an appropriate system with which they can both interact. We establish these results through a variety of terminologies which turn out to be equivalent: stability, invariance, symmetry, homeostasis.”

Robert Rosen (1934–1998) American theoretical biologist

Introduction; Quoted in: " Fundamentals of Measurement and Representation of Natural Systems by Robert Rosen http://www.panmere.com/?page_id=15" at panmere.com.
Fundamentals of measurement and representation of natural systems. (1978)

“The relations that define a system as a unity, and determine the dynamics of interaction and transformations which it may undergo as such a unity constitute the organization of the machine.”

Francisco Varela (1946–2001) Chilean biologist

Source: Autopoiesis and cognition: The realization of the living (1980), p. 137

“The relations that define a system as a unity, and determine the dynamics of interaction and transformations which it may undergo as such a unity constitute the organization of the machine.”

Humberto Maturana (1928) Chilean biologist and philosopher

Source: Autopoiesis and cognition: The realization of the living (1980), p. 137.

“A system can be defined as a set of elements standing in interrelations. Interrelation means that elements, p, stand in relations, R, so that the behavior of an element p in R is different from its behavior in another relation, R’. If the behaviors in R and R’ are not different, there is no interaction, and the elements behave independently with respect to the relations R and R’.”

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

Source: General System Theory (1968), 3. Some System Concepts in Elementary Mathematical Consideration, p. 55-56

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