A version control system (also known as a Revision Control System) is a repository of files, often the files for the source code of computer programs, with monitored access. Every change made to the source is tracked, along with who made the change, why they made it, and references to problems fixed, or enhancements introduced, by the change. 1)Yeates, Stuart. “What Is Version Control? Why Is It Important for Due Diligence?” OSS Watch. OSS Watch, 9 May 2013. Web. 15 Nov. 2015. <http://oss-watch.ac.uk/resources/versioncontrol>.