What Are Software Reliability Models?

What are software reliability models?

 

Software reliability is the probability of the software causing a system failure over some specified operating time. ... The software fails as a function of operating time as opposed to calendar time. Over 225 models have been developed since early 1970s, however, several of them have similar if not identical assumptions.

 

The reliability growth group of models measures and predicts the improvement of reliability programs through the testing process. The growth model represents the reliability or failure rate of a system as a function of time or the number of test cases.