All I know about Giving Feedback, I learned from [http://www.estherderby.com/ Esther Derby].
[http://www.estherderby.com/weblog/archive/2006_07_01_archive.html#115244372124629312 Types of feedback]
A simple recipe for [http://www.estherderby.com/weblog/archive/2006_07_01_archive.html#115244372124629312 Change-focused feedback]
Create an opening--make contact.
Describe the behavior or result.
State the impact using the word "I".
Make a request.