Dear Mahmoud Omar,
Please understand the difference between a "Performance Management System" (PMS) and a "Performance Appraisal" (PA). The latter is part of the former. Please search the internet to know the difference between the two.
The PA is conducted as per the performance cycle which could be quarterly, half-yearly or yearly. On completion of the PA session, which either the HOD or a Reporting Manager conducts for his/her junior, the marks awarded are communicated immediately.
Conducting a PA session without the disclosure of the marks is a very old procedure. The 21st-century management style demands transparency. If the results of the PA are withheld, the subordinates go back with doubt or fear in his/her mind. Further, it could demotivate him/her also. Whatever marks are awarded, whether low or high, the appraising authority gives justification for the marks avoided. This avoids the perception between an appraiser and the appraisee.
Thanks,
Dinesh Divekar