Integrated ISO · Internal audit
How to run an integrated ISO internal audit using one maintenance job
Follow one maintenance job to gather distinct evidence for ISO 9001, ISO 14001 and ISO 45001. Use PDCA to plan the audit and verify corrective actions.
Choose one completed job and follow it from approval to handover. Use the same interviews and records where they answer more than one audit question. Then record a separate conclusion for each applicable quality, environment and safety criterion. This makes the most of one site visit and shows exactly where you need more evidence.
In this illustrative example, a workshop replaced a pump on its parts washer. The internal audit follows the work order to see how the team accepted the repaired equipment, handled waste liquid and controlled worker exposure. The example is an audit trail to adapt to your own site.
Plan the sample and agree the criteria
The audit programme owner defines the objective, confirms which editions apply and assigns an auditor who can assess the work objectively. Pick a completed job with a recent change, recurring defect or material risk. Write one question for each outcome you want to test.
- Quality. What test and approval showed the washer could be released back into production? ISO’s overview of ISO 9001:2026 highlights quality culture and leadership. Ask what the operator would actually do if a restart check failed.
- Environment. Where did the waste wash liquid go, and how did the team confirm the approved handling route still applied after the change? ISO’s ISO 14001:2026 announcement highlights stronger environmental governance. Include the environmental controls affected by the maintenance in the audit scope.
- Safety. How did workers confirm the site’s isolation and handback controls were applied? The ISO catalogue lists ISO 45001:2018 as the published edition, with an amendment. Use the applicable published criteria and site procedures.
Follow the job through handover
Start with the work order number. Ask the maintenance supervisor and an operator to walk through the handover. Match their account against the dated restart test, waste handling record and isolation or permit closeout where applicable. Follow a record reference to its source and check that the job, equipment and date match. A waste record for a different job leaves the question open.
Decide what the sample supports
Suppose the restart test and approval match the work order, and the auditor can corroborate the handback checks. The waste liquid appears in the job notes, but the evidence reviewed does not show where it went. Check the storage log or relevant transfer record and ask the person who handled it. If the gap remains, link it to the specific criterion and record the evidence reviewed. A missing record alone does not establish that the liquid was mishandled.
Check the fix on a later job
The maintenance owner investigates why the waste route could not be traced and assigns an action with a due date. If the work order is updated to link the waste record, have the auditor or another objective reviewer sample a later job. Verify that the link leads to evidence for that job and that staff can explain how it was captured. Reopen the action if the same gap persists.
Keep one audit record with three conclusions
- Record the objective, sample rationale, job number, auditor and applicable criteria.
- For each discipline, record the evidence references, people consulted and the conclusion the sample supports.
- Record the action owner, due date, follow-up sample and evidence of effectiveness.
Use ISO 19011:2026 auditing guidance to inform audit planning and ASQ’s PDCA guide for the improvement cycle. Set audit criteria from your applicable standards, procedures and obligations. For the next step after raising a finding, see how to verify an audit corrective action. For independent assessment, see the ISO 14001 environmental gap assessment service.
General guidance. Use the applicable standard, scheme documents and agreed engagement criteria. Examples are illustrative and do not establish a certification outcome.