Chapter 3. Reliability

ISO/IEC/IEEE 24765:2010, Systems and software engineering—Vocabulary, defines reliability as the ability of a system or component to perform its required functions under stated conditions for a specified period of time [ISO/IEC/IEEE 24765:2010]. ISO/IEC 9126-1:2001, Software engineering—Product quality—Part 1: Quality model, provides a similar definition of reliability as the capability of the software product to maintain a specified level of performance when used under specified conditions [ISO/IEC 9126-1:2001].

Software reliability is an important factor affecting system reliability. It differs from hardware reliability in that it reflects design perfection, rather than manufacturing perfection. Wear or aging does not ...

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