Feedback Should be Like a Mirror: Neutral
As we can see in various documents on feedback, it is often seen in terms of 'good' or 'bad'.
However, feedback is neutral and should be given this way
. One can not be upset about the face he/she sees one morning in the mirror, this is the image that comes back.
Thus, I would suggest to use 'neutral' feedback or 'sandwich' feedback in order to get better results / changes in the appraisal aftermath.
We should avoid at all times that an appraisal process can be taken as a measure of control and 'punishment'.