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Usability requirements are focused on User interfaces, how easy they are to learn, how quick access to some frequent menu options are provided, etc. Suppose we have the following requirement:

 The system should show menu options after user login within 1 second.

What type of Non Functional Requirements is this? A performance requirement or usability? Thanks

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  • This question is definitely not a duplicate of the indicated question. I am asking about the difference between two types of Non Functional Req Commented Apr 17, 2019 at 15:18
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    It is both a "performance" requirement and a "usability" requirement. How quickly the menu options are shown affects usability. Commented Apr 17, 2019 at 16:28

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I would separate the requirement into two

  1. The system should show menu options

  2. Time to Interaction on all Pages/Screens should be < 1 sec

The first is a Feature requirement, the second is a 'Definition of Done' or 'Quality Expectation' requirement that would apply to all stories

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