What workers evaluation computer system do you use and why?

In most multinational cos to grade employees in a similar job role a bell shaped stack curve is used.

If you are at the top of the stack you get the highest incentive.

If you are at the very bottom you get none.

                ERP is a good payroll and employee evolution system . 

Oracle Human capital management is also good system. It is because it creatures higher quality of performance reviews. You get the bigger picture and also the small details.