is a document which will be used to 
verify all the requirements will have corresponding 
test cases. this document will have '5' columns such as
1.S.No

Traceability matrix is a document which will be used to 
verify all the requirements will have corresponding 
test cases. this document will have '5' columns such as
1.S.No
2.Requirement #id
3.Description
4.Test Case Name
5.Test Case #ID.
This document should be prepared before starting the 
Execution. For each and every change request, the RTM 
Should need to be updated correspondingly.
By using T.M we can come to the conclusion as when complete 
testing be stopped.s

Traceability Matrix Useful in following real-time situation:
  1.Decide the Number of test cases are enough To test 
    given module.
 2.To Review the Testcases .