Questions tagged [non-functional]

Nonfunctional requirements are those expectations that a system must obey (or should obey, if objectives instead of requirements) that are not functionality of the system. Functionality of a system is a change of some input state(s) to different output state(s). Examples of nonfunctional requirements include nearly all of software architectural goals/qualities, as itemized in the expanded description below.

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Guaranteeing different availability requirements

I have different availability requirements (90%, 95%, 99% guaranteed uptime) for certain subsets of data. For example, the subsets of data are split based on the possible values A, B, C. What would be ...
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4 answers
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Is a flag for analytics a functional requirement?

Refined description Because of great contributions, the description mutated as follows: My application's purpose is to register customers into a system. The requirement is: enable traceability for ...
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5 votes
3 answers
438 views

Non Functional Requirements and Use Case Diagrams

My software provides two functional requirements, and I represent them as Do A and Do B in the figure 1 below. At the same time, my software has a non-functional requirement to provide the interface ...
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Usability or performance requirement? [duplicate]

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 ...
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1 vote
2 answers
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Identification of Nonfunctional Requirements

For the most part, I am able to distinguish between functional and non-functional requirements, but at times it is not clear for me. For example, the following are non-functional but they seem ...
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3 votes
2 answers
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How security metrics are verified in testing phase?

I am required to analyze and make an architecture of an application. While analyzing the requirements I find, in my system user personally identifiable information (PII) confidentiality is a very ...
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4 answers
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Is this a functional or non-functional requirement? [duplicate]

Is this requirement: The system is required to have an easier GUI to make it more usable by any kind of user (normal or disabled user) a functional or non-functional requirement ? And Why ?
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Non-functional requirements metric and measurement

Do all non-functional requirements need a specific metric and measurement? Would a NF maintainability requirement such as: "Upgrade to a new software version shall leave all database and personal ...
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1 answer
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Is logging a valid non-functional requirement?

Working in an architecture roles I was asking the team that was developing a component to add some logging at certain points. For this I was offered and NFR document to fill in. Does logging fit as ...
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2 votes
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Do Non-Functional Requirements for Security make sense for defining SDLC?

I recently had engaged in a security discussion with my companies cyber security risk lead, discussing security controls and standards they would be holding the project to. The expectation of the ...
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