2.1 Software Reliability Specification and Software ...


"The ability of a system or component to perform its required functions under stated conditions for a specified
period of time." IEEE definition.
There are two commonly used software reliability metrics; the concept of failure is common to both definitions.
The two kinds are: the probability of failure-free operation and the failure intensity.
Probability failure-free operation is probabilistic in nature.
Failure intensity is an absolute criterion.
Software reliability metrics are:
Requirements reliability metrics.
Design and code reliability metrics.
Testing reliability metrics.