01 · Baseline
Crane setup in Zone B
The lift plan fixes where the crane stands. Every other control is built around that position.
Know when an approved safety control has drifted.
Site conditions change. ControlDrift compares each change with the controls you approved, explains which ones may no longer hold, and routes them to a competent person.
Approved state · Version 1
Lift Operation 104 — lift plan
- C-01Crane setup location: Zone B.
- C-02Exclusion zone: 6 m around operating area.
- C-03Vehicle access route: Gate 3.
- C-04Lift sequence: A → B → C.
Reported site change
“The crane has been moved approximately 8 metres east because the planned setup area is unsuitable.”
Chris Doyle · Slinger Signaller · just now
Review required · routed to Appointed Person
ControlDrift flags · a competent person decidesAffected
C-01 Crane setup location: Zone B.
Potentially affected
C-02 Exclusion zone: 6 m around operating area.
Potentially affected
C-03 Vehicle access route: Gate 3.
No impact identified
C-04 Lift sequence: A → B → C.
Lift plansRAMSPermits to workTemporary worksExclusion zonesCrane positionsAccess routesGround conditionsCompetent-person reviewVersioned baselines
How it works
Four steps. One visible gap.
Approved state, site change, drift check, human revalidation — the same loop for every high-risk activity.
One change, end to end
From approved control to human decision.
01
Approved baseline
C-01 to C-04 confirmed as Version 1 for Lift Operation 104 by the site supervisor.
02
Site change reported
“Crane moved approx. 8 m east to Zone B because the original pad is blocked.”
03
Checked against controls
C-01 affected, C-02 and C-03 potentially affected, C-04 no impact identified — each with a reason.
04
Competent person decides
The reviewer confirms, amends or holds each flagged control. Notes are mandatory.
05
New version, full trail
Version 2 is created, Version 1 stays readable, and every step is in the audit chain.
The problem
Approved isn't the same as still valid.
Built from first-hand experience in lifting operations on major UK infrastructure — where the approved plan and the conditions on the day don't always match.
Plans are approved at a moment in time
RAMS, lift plans and permits reflect the people, equipment, location and sequence agreed on the day.
Sites keep moving
Equipment is relocated, access changes, ground conditions shift. Small changes rarely trigger a formal review.
The gap stays invisible
Everyone assumes the old control still applies. ControlDrift makes the difference visible before work continues.
Human in the loop
ControlDrift flags. A competent person decides.
Every flagged control shows the original control, the reported change and the reason side by side. The reviewer confirms, amends or holds — and every decision becomes a traceable version.
- Never says “safe to proceed” or approves work
- Distinguishes affected, potentially affected and no impact
- Version 1 is preserved when Version 2 is created
- Full audit chain from baseline to decision
- Approved baselineVersion 1 · confirmed by Sam Patel
- Site changeCrane moved ~8 m east · Chris Doyle
- System analysis1 affected · 2 potentially · 1 no impact
- Human decisionJordan Reid, Appointed Person
- Revised baselineVersion 2 created · Version 1 preserved
See the drift before work continues.
Walk through Lift Operation 104 end to end in under four minutes — or sign in with a demo account and try it yourself.
ControlDrift
Construction change-control and safety assurance. Keeping approved controls aligned with real site conditions.
Use cases
- Lifting operations
- Plant movements
- Exclusion zones
Principles
- Explainable
- Human decides
- Fully traceable
© 2026 ControlDriftControlDrift is a decision-support tool and does not replace competent-person assessment.