Exigences non-fonctionnelles

Fiabilité (reliability)

  • Maturité (maturity)
    • mean time between failures (MTBF)
    • mean time to failure (MTTF)
    • product fault density
    • product stability
    • fault density
    • test density
    • test coverage
  • Tolérance aux fautes (fault tolerance)
    • disturbances
    • vulnerability
    • integrity value
    • breakdown ratio
    • operational/input error detection ratio
  • Facilité de récupération (recoverability)
    • mean time to repair (MTTR)
    • auto recovery ratio
    • mean recovery time
    • mean breakdown time
    • mean restart time
    • mean fault life
  • Disponibilité (availability)
    • full-time availability ratio (MTBF / (MTBF+MTTR))
    • relative availability ratio
    • availability ratio
  • Dégradabilité (degradability)
    • backsliding time (simulation de breakdown)

Usabilité(usability)

  • Facilité de compréhension (understandability)
    • rated understandability
    • concept clearness
    • availability of demonstration software
    • usage clearness
    • availability of input/output data items list
    • recognisability of modifiable parameters
  • Facilité d'apprentissage (learnability)
    • average learning time
    • usability of manual
    • availability of manual
    • availability of pre-learning functions
    • availability of learning functions
    • availability of help functions
    • rate of user errors
    • time required to learn operational
    • effort required to learn one operation
  • Facilité d'opération (operability)
    • expert judgement on operability
    • operability compared with sample
    • operability in practice
    • set-up installation time
    • set-up installation procedure with human interaction
    • availability of set-up performance
    • ease of set-up
    • availability of set-up installation restart
    • availability of set-up installation preparation
    • availability of set-up installation confirmation
    • default value availability ratio
    • command uniformity
    • consistency of terms in message
    • message clearness
    • skill level adaptability
    • uniformity of screen manipulating operations
    • stability of input/output areas on display
    • number of keystrokes
    • availability of reduced effort for repeated operations
    • mean time between human error operations
    • ultimate operation time
    • time for shutdown operation
    • guide function availability ratio
    • human error operation cancellability ratio
    • ability to emphasise expressions
    • response time for user
    • display time
  • Explicité (explicitness)
    • expert judgement on explicitness
    • insecure time
    • status report ratio
    • insecure time in practice
    • status of progress report availability ratio
  • (customisability)
    • configurability ratio
    • configurability effort
  • (attractivity)
    • user judgement on attractivity
  • Clarté (clarity)
    • function recognition ratio
    • function use ratio
  • (helpfulness)
    • ratio of expounding text
    • normalised ratio of expounding text
  • (user-friendliness)
    • rated user-friendliness
    • expert judgement on user-friendliness
    • user-friendliness compared to sample

Efficacité (efficiency)

  • (time behaviour)
    • batch turnaround time
    • batch capacity
    • processing time
    • processing capacity
    • average internal transaction time
    • maximum internal transaction time
    • turnaround time
    • response time
    • CPU elapsed time
    • CPU execution time
    • I/O processing time
    • waiting time
    • network processing time
    • terminal processing time
    • throughput
    • number of processed transactions
  • (ressource behaviour)
    • communication, interface memory, external memory, processor occupancy, real memory, virtual memory, file, network occupancy
    • workingset size
    • CPU, main memory, I/O channel, file, network, I/O device, terminal utilisation

Maintenabilité (maintainability)

  • Facilité d'analyse (analysability)
    • fault position recognisition ratio
    • mean failure analysis time
  • Facilité de changement (changeability)
    • modification effort per unit volume
    • correction effort per defect
    • mean fault correction, mean failture treatment, mean fault correction work time
    • mean revise work time per changed line of source code
    • fullfilment degree of maintenance document
  • Stabilité (stability)
    • ratio of new fault at revision
  • Testabilité (testability)
    • test effort per unit volume
    • number of test cases per unit volume
    • mean user's work time to verify the fault correction
    • mean work time to test the fault correction
    • test work time per changed source code line
  • Facilité à gérer (manageability)
    • control effort ratio
  • Facilité de réutilisation (reusability)
    • ratio reusable parts
    • ratio reused parts

Portabilité (portability)

  • Facilité d'adaptation (adaptability)
    • effort for portability
    • application ratio of hardware environment
    • application ratio of OS environment
    • application ratio of data environment
    • application ratio of operation environment
  • Facilité d'installation (installability)
    • installation effort
    • parameter change ratio
    • recompile program ratio
    • file change ratio
    • output list change ratio
  • Conformité (conformance)
    • standard conformance ratio
  • Facilité de remplacement (replaceability)
    • function change ratio
    • source code change ratio