A Quality of Service (QoS) is limitation on some aspect of functionality of a system or system part. Also know as
"performance requirement" or "nonfunctional requirement", a quality of service is often represented with a UML
constraint or a SysML Requirement. Some QoS properties are:
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Time
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Worst case execution time
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Average execution time
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Blocking time
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Period
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Jitter
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Minimum inter arrival time
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read-time
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write-time
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Burst length
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Event arrival pattern
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Event arrival rate
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Event arrival probability distribution function
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Reliability
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Error rate
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Risk
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Safety
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Mean Time Between Failures (MTBF)
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Defect rate
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Cost
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memory usage
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resource usage
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portability
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maintainability
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complexity
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schedulability
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availability
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usability
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