The Importance of Feedback
The communications circuit must be complete for communications to exist. The circuit begins with the sender transmitting the message along a channel of communication to the receiver. The receiver then feeds back to the sender that he has received the message.
If feedback is not included, the circuit is not complete, and the communication event, for all intents and purposes, has not taken place.
When we speak, we should expect, even require, feedback. When we listen, we should be ready and able to provide feedback. We should be as good at feedback as we are at speaking.
Speaking clubs such as Toastmasters International provide an evaluator for every speaker. First, there is the round of speeches, and then there is a round of evaluations. Prizes are awarded to the best speakers and evaluators. Speaking and evaluating go hand-in-hand.
In your evaluation, be specific by giving examples of positive points and areas for improvement. Be honest and constructive.
There's room for improvement in every speech. Your evaluation is of little use to the speaker if you don't come up with some constructive criticism.