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Feedback

Process where information about current status is used to influence future status / From Wikipedia, the free encyclopedia

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Feedback occurs when outputs of a system are routed back as inputs as part of a chain of cause-and-effect that forms a circuit or loop.[1] The system can then be said to feed back into itself. The notion of cause-and-effect has to be handled carefully when applied to feedback systems:

Simple causal reasoning about a feedback system is difficult because the first system influences the second and second system influences the first, leading to a circular argument. This makes reasoning based upon cause and effect tricky, and it is necessary to analyze the system as a whole. As provided by Webster, feedback in business is the transmission of evaluative or corrective information about an action, event, or process to the original or controlling source.[2]

Karl Johan Åström and Richard M.Murray, Feedback Systems: An Introduction for Scientists and Engineers[3]

A feedback loop where all outputs of a process are available as causal inputs to that process