I have expereinced that with each person I give feedback, it is always different. It's important to take each individuals personality, ambition, and motivation into account. I always try to start the conversation on a positive note, even if the other knows this is a meeting of constructive criticism or for behavioral issues. I have have learned when getting to the meat of the feedback, to be direct and stick to the facts. Don't let opinion or assumptions play a part. Then, always end with something positive the other has done or achieved.