Building a System Failure Rate Estimator by Identifying Component Failure Rates

  • Authors:
  • Silke Kuball;John May;Gordon Hughes

  • Affiliations:
  • -;-;-

  • Venue:
  • ISSRE '99 Proceedings of the 10th International Symposium on Software Reliability Engineering
  • Year:
  • 1999

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Abstract

Following the current trend towards an increased use of Commercial Off The Shelf (COTS) components in safety critical systems, the need arises to address safety issues related to COTS--based systems. In this paper we introduce a hierarchical model to estimate the probability of failure on demand of a software system consisting of components.Thereby evidence available on the components' failure behaviour is combined using a Bayesian approach. An additive term is proposed to model the changes in the component prior reliability once a component is transferred from the operational environment assumed by the software developer into the actual operating environment. Statistical system test (SST) data are incorporated to calculate the estimator of the system failure rate. This approach involves prior knowledge at the level where it is most likely to be available: the component level.