Print Email Facebook Twitter Modern Code Reviews in Open-Source Projects: Which Problems Do They Fix? Title Modern Code Reviews in Open-Source Projects: Which Problems Do They Fix? Author Beller, M. Bacchelli, A. Zaidman, A.E. Juergens, E. Faculty Electrical Engineering, Mathematics and Computer Science Department Software Technology Date 2014-05-28 Abstract Code review is the manual assessment of source code by humans, mainly intended to identify defects and quality problems. Modern Code Review (MCR), a lightweight variant of the code inspections investigated since the 1970s, prevails today both in industry and open-source software (OSS) systems. The objective of this paper is to increase our understanding of the practical benefits that the MCR process produces on reviewed source code. To that end, we empirically explore the problems fixed through MCR in OSS systems. We manually classified over 1,400 changes taking place in reviewed code from two OSS projects into a validated categorization scheme. Surprisingly, results show that the types of changes due to the MCR process in OSS are strikingly similar to those in the industry and academic systems from literature, featuring the similar 75:25 ratio of maintainability-related to functional problems. We also reveal that 7–35% of review comments are discarded and that 10–22% of the changes are not triggered by an explicit review comment. Patterns emerged in the review data; we investigated them revealing the technical factors that influence the number of changes due to the MCR process. We found that bug-fixing tasks lead to fewer changes and tasks with more altered files and a higher code churn have more changes. Contrary to intuition, the person of the reviewer had no impact on the number of changes. Subject Modern Code ReviewsConQATGROMACS To reference this document use: http://resolver.tudelft.nl/uuid:93c23271-d299-4f3f-883f-a42d94a97c55 Publisher ACM ISBN 978-1-4503-2863-0 Source MSR 2014: ICSE 2014 - 36th International Conference on Software Engineering, Hyderabad, India, 31 May-7 June 2014; Authors version Other version https://doi.org/10.1145/2597073.2597082 Part of collection Institutional Repository Document type conference paper Rights © 2014 The Author(s)ACM Files PDF 2014_beller_bacchelli_zai ... cts....pdf 554.24 KB Close viewer /islandora/object/uuid:93c23271-d299-4f3f-883f-a42d94a97c55/datastream/OBJ/view