Appearance

How a system operates, how it performs, what it’s appearance should be, is often described in non-functional requirements. Within this group we find coverage types like operational and load profiles, and presentation.
 
Coverage types in this group are:

• Information security-based
  • Authorisation
  • Authentication
  • Communication security
  • Data confidentiality
  • Data integrity
  • Non-repudiation
  • Privacy

• Performance-based
  • Load profiles
  • Operational profiles

• Presentation

• Usability-based
  • Alpha-testing / Beta-testing
  • Heuristics
  • Usability lab