A traceability matrix is created by associating 
requirements with the work products that satisfy them. 
Tests are associated with the requirements on which they 
are based and the product tested to meet the requirement. 

A traceability matrix is a report from the requirements 
database or repository.

By actually a tracability matrix will be get from the BRS &
SRS,from this we will be preparing use cases this is one
which tells exactly what we we want to acheive and for the
each use case we will be preparing test cases.

Hai

As per my knowledge TM is a test planing tool.
means it's a process used to cross check the test case 
design againest the customer req.
i.e here we have to find how many of the customer req r 
covered and how many of the customer req or not coverd.
for that we have to req the doc like BRS/SRS.

Hi,

      By using tracebility matrix we can check whether all 
the functionalities are covered in the testcases..


Regards,
Satya.k

Tracebility Matrix is used to map the Testcases and user 
Requirements.

To check wether we have covered all the functionalities are 
not.

Traceability Matrix is one of the most important documents 
that lives throughout the life of the project (like a 
Project Plan). Its main usage as per my experience is to 
understand and verify if each project deliverable is as per 
agreed scope. It is a very good tool for Scope 
Verification. Regards, Syed Raashid