Chapter 11: Non-functional requirements ( Duy Anh Tran )

Non-Functional Business Requirements describe the look and feel of the product. Since it can be subjective to individual taste, it is recommended that the BA try to be as specific as possible.
The Non-Functional Requirements describe the qualitative behavior, or the “how well” qualities, of the product—whether it has to be fast, or safe, or attractive, and so on. These qualities come about because of the functions that the product is required to carry out.

 Examples of non-functional requirements: "Approachable –no hesitation to use" could describe a website where the information is very clear to the user and there is no doubt on where the user should click when the user first accesses the website.

 Some other examples of Look and Feel requirements:
  • Simple to use
  • Approachable –no hesitation to use it
  • Professional looking
  • Authoritative –trustworthy
  • Attractive to the target group
  • Consistent with the client's other products.
  • Innovative and appearing to be state of the art
  • Unobtrusive –users aren’t aware of it
  • Cool
  • Exciting 
Example facts considered as non-functional requirements:
  • Look and Feel: The product shall appear to be easy to operate.
  • Usability: The product shall be able to be used by someone with wet hands.
  • Performance: The full flow of water shall be achievable with fewer than three hand movements.
  • Operational: The product shall operate correctly with water up to temperatures of 70°C.
  • Maintainability: The product shall allow any routine maintenance (such as changing a washer) to be completed in fewer than 4 minutes by a skilled operator.
  • Security: The product shall not be able to be operated by a child younger than six years old.
  • Cultural: The handle or lever shall turn in the direction dictated by local custom.
  • Legal: The product shall conform to the Queensland Plumbers and Drainers Board code of installation.


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