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richa mohantyricha mohanty 

urgent

All changes/additions to data associated with the Case after its initial
creation should be tracked in a Case History/Audit log allowing us to tell
what was changed, when and by whom. can ny one work upon this requirement
ShashankShashank (Salesforce Developers) 
This can easily be done through field history tracking: https://help.salesforce.com/HTViewHelpDoc?id=tracking_field_history.htm&language=en_US