Eric Harvey and Al Lucia wrote a booklet called, 144 Ways To Walk The Talk. They provide the following great advice about giving feedback:
1. Make it timely — give your feedback as soon as possible to the performance.
2. Make it individualized — tailor your feedback to the feedback receiver.
3. Make it productive — focus your feedback on the performance and not the performer.
4. Make is specific — pinpoint for the receiver observable actions and behaviors.