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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 .

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Non Functional Requirements

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

  2. 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?

  3. 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.

  4. 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?

  5. Examples of End user criteria • Usability: How easy is it for the user to use the system?

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