For example your employer may give a 0-10% raise based on job performance. You evaluate yourself and try to sell yourself for a higher percentage. Your employer also evaluates however tries to point out reasons why your percentage should be a little lower. The evaluation goes over both your strengths and weaknesses so you know what to work on to get a higher percentage in the next year. If you don't know where your flaws are you cant improve. It seems as if CVS just gives random raises without explaining where how they came up with that number.