What makes a copy controlled
A controlled copy stays inside a maintained update process: when the current revision changes, the user is redirected to the new version or the old copy is formally withdrawn. An uncontrolled copy is a snapshot that can keep circulating long after the document changed.
- Controlled copy: maintained under a process that keeps the user on the current revision
- Uncontrolled copy: fixed at the moment it was sent, printed, or saved
- If you keep uncontrolled copies for reference, they should be clearly marked as such
How stale copies multiply
A printed page, emailed PDF, desktop download, or phone photo becomes risky the moment a newer revision is released. It still looks legitimate, but the line is no longer working from the controlled current state.
- Printed copies in binders that are not recalled after a revision update
- PDFs emailed to operators or saved to personal folders on shared drives
- Screenshots or photos of instructions saved on operator phones
Why auditors care
During a floor walk, the auditor compares the revision at the station to the controlled source. If the operator pulls up a printed page or download that no longer matches the current revision, the usual root cause is an uncontrolled copy nobody recalled.
- Auditors compare the revision at the workstation to the master — any mismatch is a finding
- Uncontrolled copies are a recurring source of document-control findings because they blur what is actually current
- The cost is not the finding itself — it is the rework, scrap, or safety incident that the outdated instruction caused
Why a QR poster behaves differently
A QR poster is still paper, but the paper holds a link, not the document file itself. With a latest link, the poster can stay in place while the current revision behind it changes under control. With a pinned link, the poster stays tied to one released revision for traceability.
- The poster stays on the machine while the latest link resolves to the current revision
- No printed pages to recall, no emails to chase, no folder copies to delete
- Superseded revisions stay in history and pinned links where needed, not behind the main latest link
When an uncontrolled copy is acceptable
Some situations call for uncontrolled copies — customer reference copies, training handouts, or archived records. The key is marking them clearly as 'UNCONTROLLED' and not placing them at the point of use where operators might mistake them for the current revision.
- Mark uncontrolled copies with a watermark or stamp — 'UNCONTROLLED — FOR REFERENCE ONLY'
- Never place uncontrolled copies at workstations where operators could use them for production
- Use pinned links for batch records where one released revision must stay traceable