3

I got the following question for homework but I am confused on what is being asked. I'm not looking for you to give me the answers I am just wondering what non-functional quantitative requirements are? I thought non-functional requirements, such as as usability, maintainability, etc., were qualitative?

Specify and comment on seven non-functional quantitative requirements for an e-commerce application. You should choose one sub-characteristic from each of the main characteristics [from ISO 9126].

2 Answers 2

4

Quantative requirements are defined in terms of numerical values.

ISO9126 is a software quality model, which has the following characteristics:

  • Functionality
  • Reliability
  • Usability
  • Efficiency
  • Maintainability
  • Portability

Few examples:

Efficiency.

System must be able to handle 10,000 concurrent users.

Usability

System must be available in two languages: English and French.

Reference: http://www.sqa.net/iso9126.html

I can't believe they make people pay for this: http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=22749

Wish my homework was that interesting at a time. Good luck.

2
  • 10000 concurrent users is not scalibility? maybe being able to handle them within a time constraint makes it efficient.
    – jimjim
    Apr 23, 2012 at 23:35
  • Hi, scalability isn't a characteristics of a quality model, therefore I've put the requirement under efficiency. You can rephrase it to say: "System must be able to handle 10,000 concurrent users effectively."
    – CodeWorks
    Apr 24, 2012 at 7:48
1

Non-functional requirements are defined with numbers. For example, a system cannot be down more than 6 hours in a year. This is a reliability non-functional requirement.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.