“In the most abstract sense, a system is a set of objects together with relationships among the objects. Such a definition implies that a system has properties, functions, and dynamics distinct from its constituent objects and relationships.”

—  Tom R. Burns

Source: Systems theories (2006), p. 1.

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Tom R. Burns15
American sociologist 1937

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“Unfortunately, the word "system" has many colloquial meanings, some of which have no place in scientific discussion. In order to exclude such meanings, and at the same time provide a starting point for exposition we state the following definition:
A system is a set of objects together with relationships between the objects and between their attributes.
Our definition does imply of course that a system has properties, functions or purposes distinct from its constituent objects, relationships and attributes.”

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

Source: Definition of System, 1956, p. 18: Italics quote cited in: Thorbjoern Mann (1992) Building Economics for Architects. p. 140

“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

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“Understanding ecological interdependence means understanding relationships. It requires the shifts of perception that are characteristic of systems thinking—from the parts to the whole, from objects to relationships, from contents to patterns. …Nourishing the community means nourishing those relationships.”

Fritjof Capra (1939) American physicist

Epilogue: Ecological Literacy
The Web of Life (1996)

“The Systems engineering method recognizes each system is an integrated whole even though composed of diverse, specialized structures and sub-functions. It further recognizes that any system has a number of objectives and that the balance between them may differ widely from system to system. The methods seek to optimize the overall system functions according to the weighted objectives and to achieve maximum compatibility of its parts.”

Harold Chestnut (1917–2001) American engineer

Source: Systems Engineering Tools, (1965), p. 8; Cited in: Peter Allen, Steve Maguire, Bill McKelvey (2011) The SAGE Handbook of Complexity and Management. p. 35

“For any given system, the environment is the set of all objects whose behaviour is influenced by the behaviour of the primary system, and those objects whose behaviour influences the behavior of the primary system.”

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

Source: Definition of System, 1956, p. 20 cited in: Baleshwar Thaku eds. (2003) Perspectives in resource management in developing countries. p. 54

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“We no longer seek the “cause” of events in the nature of a single isolated object, but in the relationship between an object and its surroundings.”

Kurt Lewin (1890–1947) German-American psychologist

Source: 1930s, Principles of topological psychology, 1936, p. 11.

“A. D. Hall's (1962) classic account of the methodology was based on his experience with the Bell Telephone Laboratories. Hall sees systems as existing in hierarchies. In systems engineering, plans to achieve a general objective must similarly be arranged in a hierarchy, with the systems engineer ensuring the internal consistency and integration of the plans, The methodology itself ensures the optimization of the system of concern with respect to its objectives. This requires a number of steps, the most important being problem definition, choosing objectives, systems synthesis, systems analysis, systems selection, system development, and current engineering. With Hall, the system of concern is usually a physical entity.”

Mike Jackson (1951) systems scientist

Michael C. Jackson (1992) Systems Methodology for the Management Sciences. p. 74; About A.D. Hall (1962)

“What people report is not properties of their image but of the objects they are imagining. Such properties as color, shape, size and so on are clearly properties of the objects that are being imagined. This distinction is crucial. The seemingly innocent scope slip that takes image of object X with property Pro mean (image of object X) with property P instead of the correct image of (object X with property P) is probably the most ubiquitous and damaging conclusion in the whole imagery literature.”

Zenon Pylyshyn (1937) Canadian philosopher

Pylyshyn (1981, 18-19), as cited in: Ken Clements, "Visual imagery and school mathematics." For the learning of mathematics 2.2 (1981): 2-9.

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“Administration has to do with getting things done; with the accomplishment of defined objectives. The science of administration is thus the system of knowledge whereby men may understand relationships, predict results, and influence outcomes in any situation where men are organized at work together for a common purpose.”

Luther H. Gulick (1892–1993) American academic

Source: "Science, values and public administration," 1937, p. 189; cited in: Marshall W. Meyer (1985), Limits to Bureaucratic Growth, p. 18

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“Object-oriented design is a method of design encompassing the process of object-oriented decomposition and a notation for depicting both logical and physical as well as static and dynamic models of the system under design.”

Grady Booch (1955) American software engineer

Source: Object-oriented design: With Applications, (1991), p. 37

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