Editing Feed forward (control) (section)

===Open system<!--'Open system (control theory)' redirects here-->===
In [[systems theory]], an '''open system''' is a feed forward system that does not have any [[feedback loop]] to control its output. In contrast, a [[closed system (control theory)|closed system]] uses on a feedback loop to control the operation of the system.  In an open system, the output of the system is not fed back into the input to the system for control or operation.{{citation needed|date=May 2021}}