Modelling Failures Occurrences of Open Source Software with Reliability Growth

  • Bruno Rossi
  • Barbara Russo
  • Giancarlo Succi
Conference paper
Part of the IFIP Advances in Information and Communication Technology book series (IFIPAICT, volume 319)


Open Source Software (OSS) products are widely used although a general consensus on their quality is far to be reached. Providing results on OSS reliability - as quality indicator – contributes to shed some light on this issue and allows organizations to make informed decisions in adopting OSS products or in releasing their own OSS. In this paper, we use a classical technique of Software Reliability Growth to model failures occurrences across versions. We have collected data from the bug tracking systems of three OSS products, Mozilla Firefox, OpenSuse and Our analysis aims at determining and discussing patterns of failure occurrences in the three OSS products to be used to predict reliability behaviour of future releases. Our findings indicate that in the three cases, failures occurrences follow a predetermined pattern, which shows: a) an initial stage in which the community learns the new version b) after this first period a rapid increase of the failure detection rate until c) very few failures are left and the discovery of a new failure discovery is rare. This is the stage in which the version can be considered reliable.


Software failures software reliability growth open source software 


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Copyright information

© IFIP 2010

Authors and Affiliations

  • Bruno Rossi
    • 1
  • Barbara Russo
    • 1
  • Giancarlo Succi
    • 1
  1. 1.CASE – Center for Applied Software EngineeringFree University of Bolzano-BozenBolzanoItaly

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