“Adaptive system — whether on the biological, psychological, or sociocultural level — must manifest (1) some degree of "plasticity" and "irritability" vis-a-vis its environment such that it carries on a constant interchange with acting on and reacting to it; (2) some source or mechanism for variety, to act as a potential pool of adaptive variability to meet the problem of mapping new or more detailed variety and constraints in a changeable environment; (3) a set of selective criteria or mechanisms against which the "variety pool" may be sifted into those variations in the organization or system that more closely map the environment and those that do not; and (4) an arrangement for preserving and/or propagating these "successful" mappings.”

— Walter F. Buckley

Source: Sociology and modern systems theory (1967), p. 491.

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Walter F. Buckley 36

American sociologist 1922–2006

Ulric Neisser (1928–2012) American psychologist

Source: Cognitive Psychology, 1967, p. 94

“Every isolated determinate dynamic system, obeying unchanging laws, will ultimately develop some sort of organisms that are adapted to their environments.”

W. Ross Ashby (1903–1972) British psychiatrist

Ashby (1962), quoted in: V. Lawrence Parsegian (1972) This cybernetic world of men, machines, and earth systems'. p. 178: About the principle of self-organization

“Advances in hardware and network technologies have paved the way for the development of increasingly pervasive software-based systems of systems that collaborate to provide essential services to society. Software in these systems is often required to (1) operate in distributed and embedded computing environments consisting of diverse devices (personal computers, specialized sensors and actuators), (2) communicate using a variety of interaction paradigms (e. g., SOAP messaging, media streaming), (3) dynamically adapt to changes in operating environments, and (4) behave in a dependable manner. Despite signiﬁcant advances in programming languages and supporting integrated development environments (IDEs), developing these complex software systems using current code-centric technologies requires herculean effort.”

Bernhard Rumpe (1967) German computer scientist

Source: Model-driven development of complex software: A research roadmap (2007), p. 37: Introduction

“Organizations are (1) social entities that (2) are goal-directed, (3) are designed as deliberately structured and coordinated activity systems, and (4) are linked to the external environment.”

Richard L. Daft (1964) American sociologist

Source: Organization Theory and Design, 2007-2010, p. 10; Cited in: Jan A. P. Hoogervorst (2009), Enterprise Governance and Enterprise Engineering, p. 80.

“The inductive-reasoning system I have described above consists of a multitude of “elements” in the form of belief-models or hypotheses that adapt to the aggregate environment they jointly create. Thus it qualifies as an adaptive complex system. After some initial learning time, the hypotheses or mental models in use are mutually co-adapted. Thus we can think of a consistent set of mental models as a set of hypotheses that work well with each other under some criterion—that have a high degree of mutual adaptedness. Sometimes there is a unique such set, it corresponds to a standard rational expectations equilibrium, and beliefs gravitate into it. More often there is a high, possibly very high, multiplicity of such sets. In this case we might expect inductive reasoning systems in the economy—whether in stock-market speculating, in negotiating, in poker games, in oligopoly pricing, in positioning products in the market—to cycle through or temporarily lock into psychological patterns that may be non-recurrent, path-dependent, and increasingly complicated. The possibilities are rich.”

W. Brian Arthur (1946) American economist

Source: Inductive Reasoning and Bounded Rationality (The El Farol Problem) (1994), p. 8

“For a given system, the environment is the set of all objects outside the system: (1) a change in whose attributes affect the system and (2) whose attributes are changed by the behavior of the system.”

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

Source: A methodology for systems engineering, 1962, p. 61 cited in: Clute, Whitehead & Reid (1967) Progressive architecture. Vol.48, Nr. 7-9. p. 106

“According to the science of cybernetics, which deals with the topic of control in every kind of system (mechanical, electronic, biological, human, economic, and so on), there is a natural law that governs the capacity of a control system to work. It says that the control must be capable of generating as much "variety" as the situation to be controlled.”

Anthony Stafford Beer (1926–2002) British theorist, consultant, and professor

Source: Management Science (1968), Chapter 2, Chance, Risk and Malice, p. 37.

“That portion of the earth's surface which is owned and inhabited by the people of the United States is well adapted to be the home of one national family, and it is not well adapted for two or more. Its vast extent and its variety of climate and productions are of advantage in this age for”

Abraham Lincoln (1809–1865) 16th President of the United States

Source: 1860s, Second State of the Union address (1862)
Context: That portion of the earth's surface which is owned and inhabited by the people of the United States is well adapted to be the home of one national family, and it is not well adapted for two or more. Its vast extent and its variety of climate and productions are of advantage in this age for one people, whatever they might have been in former ages. Steam, telegraphs, and intelligence have brought these to be an advantageous combination for one united people.

“The dinosaurs disappeared because they could not adapt to their changing environment. We shall disappear if we cannot adapt to an environment that now contains spaceships, computers — and thermonuclear weapons.”

Arthur C. Clarke (1917–2008) British science fiction writer, science writer, inventor, undersea explorer, and television series host

Foreword to The Collected Stories (June 2000)
2000s and attributed from posthumous publications

“All the vital mechanisms, varied as they are, have only one object, that of preserving constant the conditions of life in the internal environment.”

Claude Bernard (1813–1878) French physiologist

Leçons sur les Phénomènes de la Vie Communs aux Animaux et aux Végétaux.

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