Hi Satheesh,

Good Question you asked. In most of HR activities you will observe that HR is facilitator and so in PMS which I think is very important. See HR keeps an eye on Quality of appraisal Process, How's well defined KRAs are listed, Its linkage with co.Goal, its number .,their measurable etc. Then other aspects of appraisal like Feedback from Employee is also important where HR comes in picture as employee should not rewarded / penalized becoz of being HOD favoured/disliked.Here HR can take a call and can put forward his points to Mgt.
I hope u must have realized it now and believe me its true to practice not only in books.

Regards,
Shilpi