What is boundary value analysis?

Boundary value analysis is a test case design strategy in black box testing. It is widely recognized that input values at the extreme ends of input domain cause more errors in system. More application errors occur at the boundaries of input domain. Boundary value analysis testing technique is used to identify errors at boundaries rather than finding those exist in center of input domain.

An example:
Consider that you have an input box accepting numbers between 1 and 1000 using boundary value analysis. The following are the test cases that you should have:
1) Test cases with test data exactly as the input boundaries of input domain i.e. values 1 and 1000 in our case.
2) Test data with values just below the extreme edges of input domains i.e. values 0 and 999.
3) Test data with values just above the extreme edges of input domain i.e. values 2 and 1001.

You can consider using tools such as Microsoft Test Manager and Rational TestManager for test activity management, execution and reporting.

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