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So, the first requirement clearly refers to some specific functionality of
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the Bowling Alley system, because it talks about what the system has
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to do from a functional standpoint. So, it's definitely not a non-functional
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requirement. On the other hand, the fact that the Word Count system
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should be able to process large files, is telling us something not
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about the functionality of the system, but rather about its qualities. The
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fact that it has to be scalable, that it has to be
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efficient and so we can consider this to be a non-functional requirement.
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Similarly, the fact that the Login program for a
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website should be secure is definitely telling us something
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about the quality of the system that has little
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to do with its functionality. And so this is
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also a non-functional requirement. Finally, the fact that the
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Vending Machine program should take coins as an input
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from the user is telling us something about the
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functionality of the program and therefore, is a functional requirement.
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