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Four eyes are better than two: On the impact of code reviews on software quality

Code review is advocated as one of the best practices to improve software quality and reduce the likelihood of introducing defects during code change activities. Recent research has shown how code components having a high review coverage (i.e., a high proportion of reviewed changes) tend to be less involved in post-release fixing activities. Yet the relationship between code review and bug introduction or the overall software quality is still largely unexplored.