Understanding Calibration in Appraisal Systems
It looks like your company's appraisal system is using a 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 a "calibration committee" that reviews all appraisal ratings (within departments and company-wide) to create the "performance curve" as per the company's appraisal policy. 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) 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 a rating of 2 (and its equivalent of a 5% increment). 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 was given an "outstanding" (5) rating by his immediate supervisor, but during the calibration process, he got a rating of "unsatisfactory" (2). As per company policy, those who were rated excellent were supposed to get a one-time bonus equivalent to their 2 months' basic salary, while those who were rated unsatisfactory were only entitled to a bonus of 50% of their monthly basic. Because he was shown his original rating, the supervisor expected to receive 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 the matter more.
Best regards,
Ed Llarena, Jr.
Managing Partner
Emilla International Consulting Services