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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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5 votes
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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 ...
User 19826's user avatar
5 votes
1 answer

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 ...
user1605665's user avatar
3 votes
2 answers

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 ...
Sazzad Hissain Khan's user avatar
2 votes
4 answers

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 ?
AAA's user avatar
  • 167
2 votes
1 answer

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 ...
maple_shaft's user avatar
  • 26.5k
1 vote
2 answers

Functional or non functional requirements? [closed]

I just started as a junior business analyst and working on defining the requirement for an already existing system, so I am gathering the requirements for a just added service. One of the ...
Rquestions's user avatar
1 vote
1 answer

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 ...
Senne Verhaegen's user avatar
1 vote
4 answers

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 ...
CamelCamelius's user avatar
1 vote
2 answers

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 ...
User 19826's user avatar
0 votes
1 answer

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 ...
Melanie A's user avatar
  • 339
-3 votes
1 answer

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 ...
Peter's user avatar
  • 1