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Line 3: {{more citations needed\|date=May 2022}} In [[control theory]], a '''process variable''' ('''PV'''; also '''process value''' or '''process parameter''') is the current measured value of a particular part of a [[process]] which is being monitored or [[Control system\|controlled]]. An example of this would be the temperature of a furnace. The current temperature is the process variable, while the desired temperature is known as the [[setpoint (control system)\|set-point]] (SP).<ref name=Bequette> {{cite book \|author=B. Wayne Bequette \| title = Process Control: Modeling, Design, and Simulation \| publisher =Prentice Hall Professional \| year= 2003 \| page = 5 \|url=https://books.google.com/books?id=PdjHYm5e9d4C&pg=PA5 \|isbn = 9780133536409 }} </ref>