Completion figures are easy to report and hard to trust. The evidence trail behind them is what matters.
A planned maintenance figure is only as good as the asset register behind it. If tasks are logged against a building rather than a tagged asset, a high completion rate tells you very little about the plant that keeps the site running.
A useful contract opens with an asset verification survey: every item of plant tagged, photographed and given an owner, a frequency and a statutory reference where one applies. Completion is then reported per asset, not per visit.
The second discipline is evidence. Each closed task should carry a timestamp, an engineer identity, parts used and a photograph where the work is not otherwise visible. That record is what turns a monthly report into something an auditor can accept without a follow-up meeting.
Finally, misses should be published as clearly as hits. A deferred task with a documented reason and a new date is a healthier signal than a perfect score nobody can evidence.