Feedback is a process whereby some proportion of the output signal of a system is passed (fed back) to the input. This is often used to control the dynamic ...
http://en.wikipedia.org/wiki/Feedback
Giving Feedback
Feedback defines for students what their teacher thinks is important for a topic or a subject. At its best, feedback should: ...
Provides access to the online feedback service for comments, criticism, advice, and suggestions of the Bureau's products, services or web site from those ...