Singpurwalla presents an insightful proposal on foundations of reliability [Statist. Sci. 31 (2016) 521–540], suggesting to consider reliability not as a probability but as a propensity, in particular as the unobservable parameter in De Finetti’s famous representation theorem. One specific issue considered is reliability growth, with example scenario the performance of software as it evolves over time. We briefly discuss some related aspects, mainly based on applied research on statistical methods to support software testing and insights from our research on system reliability.
"On Software and System Reliability Growth and Testing." Statist. Sci. 31 (4) 541 - 544, November 2016. https://doi.org/10.1214/16-STS583