Starting around 2000, for various technological & feature/functionality reasons, the users of PACS systems began replacing their original PACS. The replacement decision included the need to move study data from the old system to the new system. The term migration became the popular term to describe this task. Over time, methods and approaches have been developed to address the various challenges that can be encountered during a PACS data migration. This paper will describe these strategies and discuss their applicability in migration projects.