hi kumar,
first, ur question is wrong?
second , as a tester u should not ask this question.
ok let me exoplain...
tester involves from the begining of bussiness document 
designed to till the application released.
between these phases, tester learns previous application, 
reviews BD documents,use cases, prepares test scenarios and 
test cses based on modules,involves executing of test cases 
and so on... prepares  documents like TSR,Deffered bugs, 
defects reports etc.