The document discusses Atlassian's transition from centralized version control systems (CVCS) like Subversion to distributed version control systems (DVCS) like Git and Mercurial. It outlines some of the key benefits of DVCS like improved collaboration, flexibility, branching and merging workflows. It also provides tips for organizations looking to make the switch like bringing over history from the old system, using tools to replicate team processes, and emphasizing the importance of continuous integration.