System

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system : a regularly interacting or interdependent group of items forming a unified whole — Webster See also OneLook

Dictionary of Cybernetics and Systems (Principia Cybernetica)

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Roget’s II (Thesaurus.com), Merriam-Webster Thesaurus, Visuwords

Encyclopedia

System is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its environment, is described by its boundaries, structure and purpose and expressed in its functioning. — Wikipedia

Systems thinking is a way of making sense of the complexity of the world by looking at it in terms of wholes and relationships rather than by splitting it down into its parts. — Wikipedia

International Encyclopedia of Systems and Cybernetics, 2nd Edition (Charles François, Bertalanffy Center for the Study of Systems Science)
System (Encyclopædia Britannica)

Outline

Outline of Cybernetics and Systems (Principia Cybernetica)

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System (WolframAlpha)

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Foundation

Theory

Systems theory is the interdisciplinary study of systems. A system is a cohesive conglomeration of interrelated and interdependent parts that is either natural or man-made. Every system is delineated by its spatial and temporal boundaries, surrounded and influenced by its environment, described by its structure and purpose or nature and expressed in its functioning. In terms of its effects, a system can be more than the sum of its parts if it expresses synergy or emergent behavior. Changing one part of the system usually affects other parts and the whole system, with predictable patterns of behavior. For systems that are self-learning and self-adapting, the positive growth and adaptation depend upon how well the system is adjusted with its environment. Some systems function mainly to support other systems by aiding in the maintenance of the other system to prevent failure. The goal of systems theory is systematically discovering a system’s dynamics, constraints, conditions and elucidating principles (purpose, measure, methods, tools, etc.) that can be discerned and applied to systems at every level of nesting, and in every field for achieving optimized equifinality. General systems theory is about broadly applicable concepts and principles, as opposed to concepts and principles applicable to one domain of knowledge. — Wikipedia

What is Systems Theory (Principia Cybernetica: Dictionary of Cybernetics and Systems)
Systems Theory (Science Direct)

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