Editing Proportional–integral–derivative controller (section)

===Selective use of control terms===
Although a PID controller has three control terms, some applications need only one or two terms to provide appropriate control. This is achieved by setting the unused parameters to zero and is called a PI, PD, P, or I controller in the absence of the other control actions. PI controllers are fairly common in applications where derivative action would be sensitive to measurement noise, but the integral term is often needed for the system to reach its target value.{{Citation needed|date=July 2024|reason=subsection does not cite source for claims}}