Differentiate between functional and non-functional requirements of software engineering requirements.

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 Difference between Functional and Non-functional Requirements

Functional requirements

  • A functional requirement defines a system or its component.
  • It specifies "What should the software system do?" 
  • A functional requirement is specified by the User.
  • It is mandatory.
  • It is captured in the use case.
  • Defined at a component level.
  • Helps you verify the functionality of the software.
  • Functional Testing like System, Integration, End to End, API testing, etc is done.
  • Usually easy to define.


Non-functional requirements

  • A non-functional requirement defines the quality attributes of a software system.
  • It places constraints on "How should the software system fulfill the functional requirements?"
  • A non-functional requirement is specified by technical peoples e.g. Architect, Technical leaders, and software developers.
  • It is not mandatory.
  • It is captured as a quality attribute.
  • Applied to a system as a whole.
  • Helps you to verify the performance of the software.
  • Non-Functional Testing like Performance, Stress, Usability, Security testing, etc is done.
  • Usually more difficult to define.



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