I can't say much because I do not have such experience. To me, the best person to ask is the person who suggested such a peer rating exercise. He or she may know how to go about it. One thing I know is that such exercise if not handled properly, can lead to lots of ill feelings among the staff.
KL Siew has put up a sister site by the name of mylabourlaw.net, which is in effect a more user-friendly version of the present popular pesaraonline.net. The site is in the process of being fine-tuned but it is fully functional. You are invited to visit the website at http://www.mylabourlaw.net and give your views or suggestions. Queries can be posted and be responded from there as usual.