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TRIZ 40 Principles
Creative tools > TRIZ Contradiction Analysis > Principles
23. Feedback
Feedback is taking or sensing the output of a system and using this to change events which happen before, such as a thermostat being used to control temperature. You can also reverse feedback, perhaps to exaggerate or accelerate change or to cancel out an undesirable effect. Pop stars use positive feedback to create howling guitar noises. People who like silence can use noise cancelling feedback.