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Non Functional Requirements. Non functional requirements are divided into: Performance criteria Dependability criteria Cost Criteria Maintenance criteria End user criteria. Examples of Performance criteria .

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non functional requirements
Non Functional Requirements
  • Non functional requirements are divided into:
    • Performance criteria
    • Dependability criteria
    • Cost Criteria
    • Maintenance criteria
    • End user criteria
examples of performance criteria
Examples of Performance criteria
  • Response time: How soon is a user acknowledged after the request has been issued?
  • Memory: How much space is required for the system to run?
example of dependability criteria
Example of Dependability criteria
  • Robustness: Ability to survive invalid user input
  • Fault tolerance: Ability to operate under erroneous conditions
  • Security: Ability of the system to protect itself against accidental and deliberate intrusion.
examples of maintenance criteria
Examples of Maintenance criteria
  • Modifiability: How easy is it to changes the functionality of the system?
  • Portability: How easy is it to port the system to a different platform?
examples of end user criteria
Examples of End user criteria
  • Usability: How easy is it for the user to use the system?