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Quality (Attributes (Functional Attributes (the input/out behaviour ( the…

- - - - Robustness and reliability requirements
      - Functional requirements
      - Non-Functional requirements. i.e. usability, performance.
      - Software product flexibility, efficiency and maintainability
- - - - Reliability: the probability that the system operates for a period of time without violating its specification
      - Safety" the probability that the software product operates for a given amount of time without causing a catastrophic failure
    - - Confidentiality ability to prevent unauthorised access to confidential data entrusted to its custody
      - Integrity ability to prevent loss or damage to critical data
      - Authentication & Authorisation Ensure access is only grant to correct identified actors (users or systems) and that they only receive privileges according to their rightful status.
      - Availability To continue delivering service to its user community
      - Measure using MTTD (mean time to detection(of a security vulnerability)) and MTTE (Mean Time to Exploitation) and
  - - - heterogeneous - diverse in character or content.
  - - - In computer programming, orthogonality means that operations change just one thing without affecting others.
    - - Controllability: variety of inputs we can supply
      - Observability: the extent to which we can infer the output