Hi! Looks like your company's appraisal system is using the concept called "calibration" — which is a management technique associated with the forced ranking appraisal methodology.
As we all know, in the forced ranking appraisal method, there is the so-called "calibration committee" that reviews all appraisal ratings (within departments & company-wide) in order to create the so-called "performance curve" as per the appraisal policy of the company. Under this scheme, any given rating is considered "tentative" and can be changed by the committee (with a majority or consensual vote of the members) in order to arrive at the company's predetermined "ideal" or desired curve (performance ratio).
Hence, maybe your rating of "4" was the original rating that your immediate superior gave you. But upon review (and in comparison with others) by the calibration committee, they decided that you only deserve the rating 2 (and its equivalent of 5% increment). And, you were never informed by your immediate superior about your rating because keeping the result confidential is the nature of the scheme. It is also possible that your immediate superior is not aware of it because he was not a member of the committee.
I have participated in calibration committees and have seen how the system works. We had one classic example where a supervisor that was given an "outstanding" (5) rating by his immediate supervisor, but who, during the calibration process, got a rating of "unsatisfactory" (2). And, as per company policy, those who were rated excellent were supposed to get a one-time bonus equivalent to their 2 mos basic salary. While those who were rated unsatisfactory were only entitled to a bonus of 50% of their monthly basic. And, because he was shown his original rating, the supervisor started to expect that he will be getting a bonus equivalent to 2 months. When payroll time came, he was shocked to see that only 50% of his monthly basic was credited to his account. The guy complained and it shocked the entire company as the secret workings of the calibration committee were revealed.
The above matter is my biggest objection to the forced ranking appraisal methodology. That's why I decided to develop a PMS that is objective, fair, and very transparent.
Hope this clarifies this matter more.
Best regards,
Ed Llarena, Jr.
Managing Partner
Emilla International Consulting Services