In SDLC after complition of FRS document the test lead 
prepare the use case document and test plan document, then 
the tester role is start.
Plz verify and forward new answer if it is wrong answer

In most of the cases (99%) FRS will contain the Use Cases 
so need of preparing the Use Case document by the Test 
Lead, we can say that after receiving the FRS and Test Plan 
our (tester) work starts.

from the first phase of the usecase u can start the testing 


                          or
     
after completing the coding

Depends up on SDLC follwing by the comapny..

usually after completing SRS the tester role involves..

Actually dr r 2 type of testing 
1)Conventional  2)unconvention
1)Conventional testing:
This testing can done aftre the developemnt the application
2)Unconventional testing:this is starting at the SDLc life 
cycle...means at the requirement pahze itself


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From the requirement phase itself tester role starts.Once 
the requirments are given by the customer based upon these 
documents tester preapres the test strategy,testplan and 
testcase documents.

Depends up on the lifecycle we used.