„The comprehensiveness of OR’s aim is an example of a ‘systems’ approach, since ‘system’ implies an interconnected complex of functionally related components.“

—  Charles West Churchman, p. 7; cited in (2004, p. 210)
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„With increasing size and complexity of the implementations of information systems, it is necessary to use some logical construct (or architecture) for defining and controlling the interfaces and the integration of all of the components of the system.“

—  John Zachman American computer scientist 1934
p. 276, cited in: CM Pereira (2004), "A method to define an Enterprise Architecture using the Zachman Framework". in: SAC '04 Proceedings of the 2004 ACM symposium on Applied computing. pp. 1366-1371

„Biological communities are systems of interacting components and thus display characteristic properties of systems, such as mutual interdependence, self-regulation, adaptation to disturbances, approach to states of equilibrium, etc.“

—  Ludwig von Bertalanffy austrian biologist and philosopher 1901 - 1972
As cited in: Debora Hammond (2005). "Philosophical and Ethical Foundations of Systems Thinking", in: tripleC 3(2): pp. 20–27.

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„The notion of system we are interested in may be described generally as a complex of elements or components directly or indirectly related in a network of interrelationships of various kinds, such that it constitutes a dynamic whole with emergent properties.“

—  Walter F. Buckley American sociologist 1922 - 2006
p. 35 as cited in: (2006) A Typology of Emergence in Social Systems and Sociocybernetic Theory http://www.unizar.es/sociocybernetics/congresos/DURBAN/papers/bailey.pdf.

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