| Quality Characteristics | External Quality |
| Sub-characteristics | |
| Functionality | Consistency, Completeness, Currency, Precision, Accuracy, Interoperability, Functionality |
| Reliability | Availability, Recoverability, Fault Tolerance, Maturity, Reliability Compliance |
| Usability | Understandability, Manageability, Attractiveness, Learnability, Operability, Usability Compliance |
| Efficiency | Resource utilization, Time behavior, Efficiency compliance |
| Security | Confidentiality, Integrity, Non-repudiation, Accountability, Authenticity, Security Compliance |