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