This technique helps to create test cases around the boundaries of the valid data.Usually values passed are exact boundary values, + or – 1 at the lower boundary and+ or – 1 at the higher boundary. This is a technique to prove that  software is error-proof to boundaries.

For Example if you are writing a test case for the condition of age should be greater that 18 & less than 35, the we have to write test case for 17,18,19 & 34,35,36


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