It's a mapping between requirements and test cases..

We use tracibility matrix to check whether all the 
requirements are tested or not?
We start prepare tracibility matrix in the information 
gathering phase itself. For each requiremetn, we have 
requirement id, description. priority. We will identify the 
test conditions for that requiremetn and map the test cases 
for that requirement.
By using this mapping, we can ensure that how many test 
cases each requirement is passed. If for each requirement 
it meets the scuess criteria, then we can stop testing of 
the project.
Generally tracibility matrix consists of:
Req. ID|Desc|Priority|TestConditions|TestCaseID|Phase of 
testing

Hi,
Tracability Matrix is the mapping between the test cases and
the requirements of the customer.It ensures the
satisfaction,that is all the requirements of the customer
have been met according to the test cases.


Plz correct me if i m wrong....

Regards 
nitin9360@gmail.com

Generally tracibility matrix consists of:

Req. ID|Desc|TestCaseID|Phase of testing

It is done by Test Lead, to analyze the gap between the 
return test cases and the requirements

Tracebility Matrix is the mapping between requirements and 
test cases.
I will explain, How I did in QC for my project. we will 
upload the requirements in QC,that will be placed in 
Requirements tab. and as well as we upload the test cases 
also in QC.

we will map the requirements and test cases in QC itself.
we can see which requirements are covered or not in 
QC.after execute the test cases we can see the status of 
the test cases and requirements also.