Optimal Test Distributions for Software Failure Cost Estimation

  • Authors:
  • Walter J. Gutjahr

  • Affiliations:
  • Univ. of Vienna, Vienna, Austria

  • Venue:
  • IEEE Transactions on Software Engineering
  • Year:
  • 1995

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Abstract

In this article, we generalize the input-domain based software reliability measures by Nelson and by Weiss and Weyuker, introducing expected failure costs under the operational distribution as a measure for software unreliability. This approach incorporates in the reliability concept a distinction between different degrees of failure severity. It is shown how to estimate the proposed quantity by means of random testing, using the Importance Sampling technique from Rare Event Simulation. A test input distribution that yields an unbiased estimator with minimum variance is determined. The practical application of the presented method is outlined, and a detailed numerical example is given.