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Reference /VM 1997/ V-Model 97, Lifecycle Process Model.
(Source: in accordance with /ISO 9126, 1991/)

A set of a attributes that bear on the capability of software to maintain its level of performance under stated conditions for a stated period of time.

Note: Applying the reliability theory to software is particularly difficult. With regard to the present hardware experience any considerations about reliability are in the context of failures based on aging or wear. With regard to software, wear and aging do not occur in the same way as occurs with hardware. Any limitations concerning the reliability of the software are ascribed to an error in the original design which - based on tests that have possibly not been completely built into the program - will result in a residual error rate whose effects and failures based on aging and wear cannot be foreseen in a given application period.

In this respect reliability may also be reduced by manipulation during use ( e. g. by introducing viruses).

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