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Because the PCN is a design document, many edits and updates will be made during its development. Upon acceptance of the software and the process, the document should be stored electronically and protected. This will allow the document to be used by operators and staff while edits are controlled. As permanent changes are identified in the process and implemented in the software, these changes must be reflected in the PCN and implemented in a secure manner.

If a document management system is in use, the PCN can be stored, protected, and accessed from that system. If this is not available, a secured drive with a regular backup program is suitable. A link on an HMI screen could be used to allow operators direct access to the PCN from the associated process page or a link through the intranet. Relying on printed materials may result in superseded versions of the PCN being used, copied, or distributed, thereby providing incorrect information.