Critical assessment of a process or activity or of their results.
(control theory) The part of an output signal that is looped back into the input to control or modify a system.
The high-pitched howling noise heard when there is a loop between a microphone and a speaker.
To generate the high-frequency sound by allowing a speaker to cause vibration of the sound generator of a musical instrument connected by an amplifier to the speaker.
To provide informational feedback to.
To convey by means of specialized communications channel.