“A system is a set of objects with relationships between the … in may be described generally as a complex of elements or components directly or indirectly related in a causal network, … Also, we are mainly interested in systems within which some process is continually going on, including an interchange with an environment across the boundary. It is generally agreed that when we deal with the more open system with a highly flexible structure, the distinction between the boundaries and the environment becomes a more and more arbitrary matter, dependent upon the purpose of the observer.”

— Arthur D. Hall

Cited in: Addison C. Bennett (1978) Improving management performance in health care institutions: a total systems approach.. p. 40
A methodology for systems engineering, 1962

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Arthur D. Hall 18

American electrical engineer 1925–2006

Walter F. Buckley (1922–2006) American sociologist

Source: Society: A Complex Adaptive System--Essays in Social Theory, (1998), p. 35 as cited in: Kenneth D. Bailey (2006) A Typology of Emergence in Social Systems and Sociocybernetic Theory http://www.unizar.es/sociocybernetics/congresos/DURBAN/papers/bailey.pdf.

“From the statements we have made, a stupendous perspective emerges, a vista towards a hitherto unsuspected unity of the conception of the world. Similar general principles have evolved everywhere, whether we are dealing with inanimate things, organisms, mental or social processes. What is the origin of these correspondences?
We answer this question by the claim for a new realm of science, which we call General System Theory. It is a logico-mathematical field, the subject matter of which is the formulation and derivation of those principles which hold for systems in general. A "system" can be defined as a complex of elements standing in interaction. There are general principles holding for systems, irrespective of the nature of the component elements and of the relations or forces between them.”

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

Source: 1950s, Problems of Life (1952, 1960), p. 199 as cited in: D.C. (1969) "Systems Theory — A Discredited Philosophy". in: Abacus V. p. 8

“System' is the concept that refers both to a complex of interdependencies between parts, components, and processes, that involves discernible regularities of relationships, and to a similar type of interdependency between such a complex and its surrounding environment.”

Talcott Parsons (1902–1979) American sociologist

Talcott Parsons (1968) "Systems Analysis: Social Systems" in: David L. Sills ed. International Encyclopedia of the Social Sciences. p. 458; Cited in: Ida R. Hoos (1972) Systems Analysis in Public Policy: A Critique.

“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

“Thus, there exist models, principles, and laws that apply to generalized systems or their subclasses, irrespective of their particular kind, the nature of their component elements, and the relations or „forces‟ between them. It seems legitimate to ask for a theory, not of systems of a more or less special kind, but of universal principles applying to systems in general. In this way, we postulate a new discipline called General Systems Theory. Its subject matter is the formulation and derivation of those principles, which are valid for „systems‟ in general.”

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

Source: General System Theory (1968), 2. The Meaning of General Systems Theory, p. 32

“The management of a system has to deal with the generation of the plans for the system, i. e., consideration of all of the things we have discussed, the overall goals, the environment, the utilization of resources and the components. The management sets the component goals, allocates the resources, and controls the system performance.”

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

Source: 1960s - 1970s, The Systems Approach (1968), p. 44

“Formulating a model of a system should start from the question “Where is the boundary, that encompasses the smallest number of components, within which the dynamic behavior under study is generated?””

Jay Wright Forrester (1918–2016) American operations researcher

Source: Principles of Systems (1968), p. 4-2; as cited in Richardson (2011)

“Causality applies only to a system which is left undisturbed. If a system is small, we cannot observe it without producing a serious disturbance and hence we cannot expect to find any causal connexion between the results of our observations. Causality will still be assumed to apply to undisturbed systems and the equations which will be set up to describe an undisturbed system will be differential equations expressing a causal connexion between conditions at one time and conditions at a later time. These equations will be in close correspondence with the equations of classical mechanics, but they will be connected only indirectly with the results of observations.”

Paul Dirac book Principles of Quantum Mechanics

I. The Principle of Superposition - 1. The Need for a Quantum Theory
The Principles of Quantum Mechanics (4th ed. 1958)

“In concept a feedback system is a closed system. Its dynamic behavior arises within its internal structure. Any action which is essential to the behavior of the mode being investigated must be included inside the system boundary.”

Jay Wright Forrester (1918–2016) American operations researcher

Source: Principles of Systems (1968), p. 4-1 as cited in: Richardson, George P. " Reflections on the foundations of system dynamics http://obssr.od.nih.gov/issh/2012/files/Richardson%202011.pdf." System Dynamics Review 27.3 (2011): 219-243.

“The social system is, thus, a very complex entity. As an organization of human interests, activities and commitments, it must be viewed as a system and in functional perspective. This is the key to its lines of organization, its modes of differentiation, and its integration. Such a system may be considered as both structure and process, in different aspects and for different scientific purposes. Structurally, we have suggested that there is a double basis for systematizing differentiation and variation : that internal to the primary social system itself and that involved in its relations to its primary environments, as analyzed with reference to the general system of action. Processually, the categories of analysis must follow from and integrate with those of structure. I suggest that, given the central position language as definitive of human society, the more differentiated and specialized symbolic media of interchange constitute the master scheme for the systematic analysis of social system processes.”

Talcott Parsons (1902–1979) American sociologist

Talcott Parsons (1968) "Systems Analysis: Social Systems" in: David L. Sills ed. International Encyclopedia of the Social Sciences. p. 472

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