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Answer Posted / gopal krishna
BVA means boundary value analysis, is the most commonly used test case design method for black box testing.In this techinque we used to find error in the boundaries of input value rather than the center of the input value range.for finding error we use this method(n,n-1,n+1).
example-suppose the input value test box range is given from 1 to 1000 in this case we have to findvalid and invalid input.so,range is (1-1000)
for 1
n=1,n-1=0,n+1=2
for1000
n=1000,n-1=999,n+1=1001
so there are 6 case (0,1,2,1000,999,1001).
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