Salary Revision Strategy & Performance Appraisal

Hi Friends
Can you please guide me through the various steps involved in deciding the salary increment for employees? I need your valuable advice on how are usual IT companies deciding on their salary increment duration (period) and performance appraisal. What is the usual rate of increment in IT companies (especially in Cochin, Kerala).
Thanks in advance
Sujith M

SUJITH USUALLY IN IT FIRMS SALARY HIKE S IN DUE RESPECT TO THE PERFORMANCE OF THE SPECIFIC EMPLOYEE.THE NORMAL PEROFRMANCE APPRAISAL IS DONE AND ANALYSIS IS DONE ON THE RESPECTIVE EMPLOYEE ON THE EXPECTED PERFORMANCE AND HOW MUC HE HAS PERFORMED CURRENTLY.A TAB IS FIXED FOR SALARY HIKE WHICH IS DIFFERENT FOR DIFFERENT FIRMS AND AS PER THIS SALARY HIKE IS DONE
HOPE THIS IS OF SOME USE

SUJITH USUALLY IN IT FIRMS SALARY HIKE S IN DUE RESPECT TO THE PERFORMANCE OF THE SPECIFIC EMPLOYEE.THE NORMAL PEROFRMANCE APPRAISAL IS DONE AND ANALYSIS IS DONE ON THE RESPECTIVE EMPLOYEE ON THE EXPECTED PERFORMANCE AND HOW MUC HE HAS PERFORMED CURRENTLY.A TAB IS FIXED FOR SALARY HIKE WHICH IS DIFFERENT FOR DIFFERENT FIRMS AND AS PER THIS SALARY HIKE IS DONE
HOPE THIS IS OF SOME USE

Hi peoplesdg
Really appreciate your comments regarding this. I know that the salary hike varies from company to company and from employee to employee based on their performance, but I was looking for a standard (minimum) percentage of increase which are offered to the employees annually.. No matter how he/she performs.
So if there are some (un)defined standards for the same, can you please provide me some comments on this?
Thanks once again for your prompt response and valuable comments.
Regards
Sujith