Feedback
Open loop systems
The simplest system where the input sends an electronic signal to the process and the process signals the output to respond. are the simplest type of system. The The place where a force enters a system. sends an electronic signal to the process, and the process signals the output to respond.
Closed loop systems
A system in which feedback from the output is 'fed back' into the system to modify the way it works. have an added dimension of Information used to modify performance., where a signal from the output is sent back to the input. The feedback information controls the input and provides an automated system.