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I've taken a class on software testing best practises and test design. In the content, they have a model that basically shows that the three items are derived in this way:
Requirements > Use case > scenarios > test case > test script
I'm fine with the last two but what are the differences between the first three? Use cases seem to take on the same definition as both requirements and scenarios or at least bounce back and forth. I have not been able to find a clear example that shows:
this is a requirement statement
this is a use case of the requirement
this is a scenario of the use case
Can you clear this up and give an example?