once we complete the preparation of test cases we have to 
know whether those are correct r not.any thing we missed 
out we have to review the testcase.

 this can be done  with reference of requirements by using 
tracebility matrix.

HI
   Tc Review has different Phases.
   1. Peer review.
   2. Review by Test Lead/Project Manager.
   But
      Retreasibility Matrix is to Find the Missing
      functionalites by Mapping TC & Screen Shot or
      Mapping between TC & Requirement.

      sun_ramprasad.

Test case is nothing but a simple review of test cases
according to application to find undiscovered error and to
test that all test cases are covering all paths of
application. Mainly it is done when any change has been done
in application .we review all test cases so that any path of
any application should not go ?untested?.

once we completed the test case we have review the testcase 
whether the testcase is correct or not or any thing missing 
with refrence to requirement using tracebility matrix