Background: Due to the characteristics of the maintenance process followed in open\nsource systems, developers are usually overwhelmed with a great amount of bugs. For\ninstance, in 2012, approximately 7,600 bugs/month were reported for Mozilla systems.\nImproving developers� productivity in this context is a challenging task. In this paper,\nwe describe and evaluate the new version of NextBug, a tool for recommending similar\nbugs in open source systems. NextBug is implemented as a Bugzilla plug-in and it was\ndesign to help maintainers to select the next bug he/she would fix.\nResults: We evaluated the new version of NextBug using a quantitative and a\nqualitative study. In the quantitative study, we applied our tool to 130,495 bugs\nreported for Mozilla products, and we consider as similar bugs that were handled by\nthe same developer. The qualitative study reports the main results we received from a\nsurvey conducted with Mozilla developers and contributors. Most surveyed developers\nstated their interest in working with a tool like NextBug.\nConclusion: We achieved the following results in our evaluation: (i) NextBug was able\nto provide at least one recommendation to 65% of the bugs in the quantitative study,\n(ii) in 54% of the cases there was at least one recommendation among the top-3 that\nwas later handled by the same developer; (iii) 85% of Mozilla developers stated that\nNextBug would be useful to the Mozilla community.
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