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DefinitionGeneric metric options
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External qualityAvailabilitymeasure of the planned up time during which the system’s services are available for use and fully operational1) uptime / (uptime + downtime)
2) mean time between failures / (mean time between failures + mean time to repair)
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Installabilitymeasure of how easy it is to perform the installation operations correctlymean time to install the system
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Integritymeasure of preventing information loss and preserving the correctness of data entered into the system# of integrity violations and/or data losses in a period of time
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Interoperabilitymeasure of how readily the system can exchange data and services with other software systems and how easily it can integrate with external hardware devicestin eff = ∆treq + ∆ttreat + ∆tret + tuse for each operation between our product and other systems
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Performancemeasure of the responsiveness of the system to various user inquiries and actions1) Response time - Number of seconds to display a webpage
2) Throughput - Credit card transactions processed per second
3) Data capacity - Maximum number of records stored in a database
4) Dynamic capacity - Maximum number of concurrent users of a social media website
5) Predictability in real-time systems - Hard timing requirements for an airplane’s flight-control system
6) Latency - Time delays in music recording and production software
7) Behavior in degraded modes or overloaded conditions - A natural disaster leads to a massive number of emergency telephone system calls
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Reliabilityprobability of the software executing without failure for a specific period of time1) % of operations that are completed correctly,
2) average length of time the system runs before failing (mean time between failures, or MTBF)
3) maximum acceptable probability of a failure during a given time period
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Robustnessdegree to which a system continues to function properly when confronted with invalid inputs, defects in connected software or hardware components, external attack, or unexpected operating conditionContext based
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Safetydegree of preventing a system from doing any injury to people or damage to propertyContext based
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Securitydegree of unauthorized access to system functions or data, ensuring that the software is protected from malware attacks, and so onContext based
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Usabilitymeasure of the effort required to prepare input for a system, operate it, and interpret its outputs1) The average time needed for a specific type of user to complete a particular task correctly.
2) How many transactions the user can complete correctly in a given time period.
3) What percentage of a set of tasks the user can complete correctly without needing help.
4) How many errors the user makes when completing a task.
5) How many tries it takes the user to accomplish a particular task, like finding a specific function buried somewhere in the menus.
6) The delay or wait time when performing a task.
7) The number of interactions (mouse clicks, keystrokes, touch-screen gestures) required to get
to a piece of information or to accomplish a task.
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Internal qualityEfficiencymeasure of how well the system utilizes processor capacity, disk space, memory, or communication bandwidth. % of free processor capacity / memory available / other parameter during max load testing
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Modifiabilitymeasure of how easily the software designs and code can be understood, changed, and extended. Context based
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Portabilitymeasure of how easily the software can run in different operating environmentsContext based
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Reusabilitymeasure of how easily a software component can be converted for use in other applicationsContext based
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Scalabilitymeasure of how easily the application can grow to accommodate more users, data, servers, geographic locations, transactions, network traffic, searches, and other services without compromising performance or correctnessContext based
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Verifiabilitymeasure of how well software components or the integrated product can be evaluated to demonstrate whether the system functions as expected.Context based
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