given for a good reason
specific and descriptive
relevant
about behavior that can be changed
given at appropriate time (usually right after observation but in appropriate setting)
open to discussion
a balance of positive and negative
Do not attempt to give feedback until you have established the correct climate: a strong, trusting relationship.
Explain that the purpose of feedback is to share perceptions of what is currently working, not working, and to try to improve and learn.
Give feedback only after using good listening skills to understand the other's perspective.