Automated prediction of bug report priority using multi-factor analysis


Bugs are prevalent. To improve software quality, developers often allow users to report bugs that they found using a bug tracking system such as Bugzilla. Users would specify among other things, a description of the bug, the component that is affected by the bug, and the severity of the bug. Based on this information, bug triagers would then assign a priority level to the reported bug. As resources are limited, bug reports would be investigated based on their priority levels. This priority assignment process however is a manual one. Could we do better? In this paper, we propose an automated approach based on machine learning that would recommend a priority level based on information available in bug reports. Our approach considers multiple factors, temporal, textual, author, related-report, severity, and product, that potentially affect the priority level of a bug report. These factors are extracted as features which are then used to train a discriminative model via a new classification algorithm that handles ordinal class labels and imbalanced data. Experiments on more than a hundred thousands bug reports from Eclipse show that we can outperform baseline approaches in terms of average F-measure by a relative improvement of up to 209 %.

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We would like to thank Serge Demeyer and Foutse Khomh for their comments and advice during our ICSM’13 paper presentation and in the subsequent email exchanges. Their comments and advice motivate us to consider the three additional scenarios: “Assigned”, “First”, and “No-P3”. We would also like to acknowledge Kun Mei, Shaowei Wang, Yang Feng, Lingfeng Bao, and Wenchao Xu for their help in the collection of status histories of bug reports that we analyze in this study.

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Correspondence to Yuan Tian.

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Communicated by: Yann-Gaël Guéhéneuc and Tom Mens

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Tian, Y., Lo, D., Xia, X. et al. Automated prediction of bug report priority using multi-factor analysis. Empir Software Eng 20, 1354–1383 (2015).

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  • Bug report management
  • Priority prediction
  • Multi-factor analysis