What is revision control?
Revision control is the discipline of tracking each iteration of a drawing or document so that everyone works from the current version, while superseded versions stay on the record. Each revision carries a unique reference, one revision is the current version in use, and every earlier one is kept and marked superseded rather than deleted.
How revision control works for asset owners.
An asset runs for decades, and its drawings are edited many times. Each change supersedes the drawing and replaces it with a new version, so the reference you hold has to tell you which version is current and where the earlier ones went.
The drawing number and the revision together identify one exact version of a drawing, so a change is always made against a known revision.
The current revision is recorded in the title block, so anyone viewing the file, inside the system or externally, can read which version they hold.
Many teams run alpha revisions through the project phase, then numeric revisions once a drawing is issued as-constructed, with minor revisions for the iterations inside a single change cycle. See drawing revision numbering.
A replaced revision is marked superseded and stays on the record, so no one mistakes an old sheet for the live one and the current revision of every drawing stays visible in one place.
Revision control, built into the drawing record.
Lunr holds drawing files under revision control and runs every change through a document workflow, so the current revision, the file, and the record never drift apart.
Editing a drawing moves it into a draft state and locks it to one editor, the change goes to an approver for review, and on approval the revision is released as a master version. See workflows.
Each time a drawing goes through workflow, Lunr increments the major and minor revisions, so no one has to remember to change them by hand.
The new revision is synchronised back to the drawing title block automatically, so the revision on screen always matches the revision in the file.
Every change is recorded on the document, so the record shows who changed a drawing, and when.
Questions about revision control.
What happens to a superseded drawing, how major and minor revisions differ, and how Lunr keeps the record.
- What happens to a drawing when a new revision is issued?
- The existing drawing is superseded and replaced by the new version. The superseded revision is marked superseded and kept on the record rather than deleted, so no one mistakes it for the current sheet. The drawing number and the current revision together form the unique reference to the version in use.
- What is the difference between a major and a minor revision?
- A major revision is a released iteration of a drawing, for example alpha revisions through the project phase and numeric revisions once it is issued as-constructed. A minor revision, written in an alpha.numeric form like A.1, represents the iterations a drawing goes through as it is reviewed and adjusted inside a single change cycle. This is consistent with ISO 19650-2 revision control during work in progress.
- How does revision control work in Lunr?
- Lunr holds drawing files under revision control and runs each change through a document workflow. Editing locks the document to one editor, the change goes to an approver for review, and on approval the revision is automatically updated and released as a master version. The new revision is synchronised back to the title block, and every change sits on a full audit trail.
Keep every revision on the record.
Book a walkthrough and watch Lunr run a change through workflow, increment the revision, and keep the superseded version on the audit trail.
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- entity
- Lunr Labs Pty Ltd
- location
- Melbourne AU
- workspace
- documents.lunr.app
- rev
- 2026