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The capability of the software product to maintain a specified level of performance in cases of software faults or of infringement of its specified interface. [ ISO/IEC 9126-1 ]
Reliability [ ISO/IEC/IEEE 24765 ]: The ability of a system or component to perform its required functions under stated conditions for a specified period of time.
Software Reliability [ ISO/IEC/IEEE 24765 ]: The probability[8] that software will not cause the failure of a system for a specified time under specified conditions.
[8] The probability is a function of the inputs to and use of the system as well as a function of the existence of faults in the software. The inputs to the system determine whether existing faults, if any, are encountered.