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"In a simple feedback system a specific physical quantity is being controlled, and control is brought about by making an actual comparison of this quantity with its desired value and utilizing the difference to reduce the error observed. Such a system is self-correcting in the sense that any deviations from the desired performance are used to produce corrective action."
↑ SK Singh (2010). Process Control: Concepts Dynamics And Applications. PHI Learning Pvt. Ltd. p. 222. ISBN 9788120336780. https://books.google.com/books?id=CRQr3HvzN40C&pg=PA222
↑ For example, input and load disturbances. See William Y. Svrcek; Donald P. Mahoney; Brent R. Young (2013). A Real-Time Approach to Process Control (3rd ed.). John Wiley & Sons.