Conceptual models for the reliability of diverse systems-new results

摘要: We address problems in modelling the reliability of multiple-version software, and present models intended to improve understanding various ways failure dependence between versions can arise. The previous models, by Eckhardt Lee (1985) Littlewood Miller (1989), described what behaviour could be expected "on average" from a randomly chosen pair "independently generated" versions. Instead, we problem predicting specific concept variation difficulty situations which software may subject is central cited. show that it has even more far-reaching implications than previously found. In particular, consider practical two phenomena: varying probabilities over input sub-domains or operating regimes; positive correlation successive executions control software. Our analysis provides some advice for regulators, useful insight into non-intuitive aspects process diverse