188 Empirical Research in Software Engineering
kind of software repositories are suitable for extracting such kind of data. After a rigor-
ous study and analysis, we have chosen those software repositories that employ “Git” as
the VCS (http://git-scm.com). The reasons for selecting Git-based software systems are
as follows:
1. Git is the most popular VCS and the defect and change data can be extracted in
relatively easier ways through the change logs maintained by Git.
2. A large number of OSS systems are maintained through Git, including Google’s
Android OS.
Thus, by employing DCRS, we can easily obtain defect and change data for a large number
of OSS repositories that are based on Git VCS.
5.11.2 Motivation
Previous studies have shown that ...