ISBN : 978-81-963532-2-3 (E-Book) (a) Hardwareproduct (b) Softwareproduct Fig.26.1: Changeinfailurerateofaproduct ReliabilityMetrics The reliability requirements for different categories of software products may be different. Forthis reason, it is necessary that the level of reliability required for a software product should bespecified in the SRS (software requirements specification) document. In order to be able to dothis, some metrics are needed to quantitatively express the reliability of a software product. Agood reliability measure should be observer-dependent, so that different people can agree on thedegree of reliability a system has. For example, there are precise techniques for measuringperformance, which would result in obtaining the same performance value irrespective 122 Software Engineering Keerthana P, Manasa KN, Ganga D Bengal
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