Quality characteristicsAnton Hrytsenko

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Quality characteristicsISO/IEC 25010:2011• Functionality• Reliability• Usability• Efficiency• Maintainability• Portability

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Technical processesISO/IEC 12207:2008• Development

Requirements definition Requirements analysis Architectural design Implementation Integration Testing Installation Acceptance

• Operation• Maintenance• Disposal

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Processes and characteristicsProcess CharacteristicDevelopment Functionality

UsabilityOperation Reliability

EfficiencyMaintenance Maintainability

Portability

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Roles and characteristicsRole CharacteristicArchitect Reliability

EfficiencyPortability

Developer FunctionalityMaintainability

Designer Usability

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FunctionalitySub-characteristic FactorSuitability UsersAccuracy UsersSecurity EnvironmentsInteroperability Environments

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UsabilitySub-characteristic FactorOperability EnvironmentsUnderstandability UsersAttractiveness UsersLearnability Users

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ReliabilitySub-characteristic FactorMaturity TechnologiesFault-tolerance EnvironmentsRecoverability Tools

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EfficiencySub-characteristic FactorTime behavior TechnologiesResource utilization Tools

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MaintainabilitySub-characteristic EffortAnalyzability Identify a change.Changeability Introduce a change.Testability Verify a change.Stability Avoid the negative impact of a

change.

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PortabilitySub-characteristic EffortInstallability Install a product.Adaptability Support a new specification.

Support a new operating environment.

Replaceability Replace a component.

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Approaches• Load balancing• Stateless protocols• Redundancy • Graceful degradation• Switchover and failover

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Styles• Event-driven• Resource-oriented• Self-contained