In my experience I have found that it is hard for people to hear criticism about themselves. This is why I believe that feedback is best given through a compliment sandwich. We first give information that a person would be more open to usually about their positive behaviors. Then give the bitter news of where performance can be improved, finishing it off with how this behavior will look in the future when corrected and the future benefits. Then give an appraisal of some of the positive things this person brings to the team. This is like the idea that I heard as a child in the movie Marry Poppins "a spoonful of sugar makes the medicine go down. In such a delightful way"