Current Practice:
The Roper Center has implemented a version control protocol for all digital files within the archive. All files upon arrival at the Roper Center are assigned a baseline-level version designation (version 1) and moved into a temporary holding storage area. A new incremental version number will be assigned to an existing file whenever it has been modified and/or a new file is created for that study during a process event. These processing events may include file format migration, digitization of analog materials, minor or major corrections, and/or any value-added file modifications. Post-processing, each version of the file is stored in archival storage for long-term preservation. The Roper Center provides web access only to the most recent version of the files in a study. The version number for each study is equal to the highest version number of its primary dataset and is available in the generated citation.
For example: