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NFR Metrics
publish date: 2026/06/06 23:20:7.087014 UTC
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Which of the following metrics are used to measure Reliability as a non-functional system property? Select all that apply.
Correct Answer
(1) Mean time to failure
(2) Probability of unavailability
(3) Rate of failure occurrence
Explanation
Reliability is measured by: mean time to failure, probability of unavailability, rate of failure occurrence, and availability. Training time measures ease of use. Number of ROM chips measures size. Percentage of target-dependent statements measures portability.
Reference
Software Engineering, Ian Sommerville, 9th edition