8 min read
How do you interview workers and collect evidence in an ISO 45001 audit?
Practical techniques for talking to workers, verifying what you hear and recording evidence that stands up in your audit report.
3FOLD Training is a CQI IRCA Approved Training Partner (ATP 6039853) · Licensed by KHDA, Dubai
An occupational health and safety (OH&S) management system lives or dies on the shop floor, and the people who know it best are the workers. If you audit only paperwork, you will miss what really happens. This guide is for auditors working to ISO 45001:2018 and for anyone preparing for the CQI (Chartered Quality Institute) and IRCA (International Register of Certificated Auditors) ISO 45001 Lead Auditor course.
To interview workers and collect evidence in an ISO 45001 audit, combine 3 methods: interviews, observation and review of documented information. Prepare by understanding the process, its requirements and the worker’s role. Use open questions, listen more than you talk, and verify what you hear against records, observation or other people. Record specifics, such as who said what, what you saw and which document you checked.
| Standard audited | ISO 45001:2018, Occupational health and safety management systems |
| Evidence methods | Interviews, observation and review of documented information |
| Best question style | Open, such as “walk me through” and “show me” |
| Rule for evidence | Only information that can be verified should be accepted |
| Related requirement | Clause 5.4, consultation and participation of workers |
| Audit guidance | ISO 19011, Guidelines for auditing management systems |
| Related course | ISO 45001 Lead Auditor · PR357 · CQI and IRCA |
How do you collect evidence in an ISO 45001 audit?
Collect evidence through interviews, observation and review of documented information, then verify it.
ISO 19011 guidance names these 3 methods and adds that only information that can be verified to some degree should be accepted as audit evidence. Check the current ISO 19011 edition for the exact wording. Our guide to how an ISO 45001 audit works shows where evidence collection sits in the audit.
| Method | What it tells you | OH&S example |
|---|---|---|
| Interview | What people know and do | Ask an operator how they report a hazard |
| Observation | What actually happens | Watch a lockout task or a forklift crossing |
| Documented information | What was planned and recorded | Review a risk assessment or training record |
Want to practice interviews in a realistic audit? The course includes a full audit simulation on a realistic case study.
Who should you interview in an ISO 45001 audit?
Interview people at several levels, including frontline workers, supervisors, managers and contractors, not only the OH&S manager.
ISO 45001:2018 clause 5.4 requires processes for consultation and participation of workers, so what workers say is direct evidence about whether that process works. Our guide to worker consultation and participation in ISO 45001 explains the requirement. A good interview sample covers different shifts, tasks and employers on site, and it includes at least some people who face the highest risks.
How do you prepare for a worker interview?
Prepare by understanding the process, the requirements and the worker’s role, and write prompts rather than a rigid script.
Before each interview, be clear on 3 things: the process you are auditing, the requirements that apply to it, and the person’s role in it. Then write a few prompts, not a long checklist. Our ISO 45001 audit plan and checklist guide shows how the plan and checklist shape your interview questions, and our guide to the documents required for an ISO 45001 audit helps you decide what to read first.
How do you run the interview?
Open with a clear purpose, ask open questions, listen more than you talk and avoid leading questions.
- Introduce yourself and explain why you are there and how the information will be used.
- Start with the worker’s own job, so the conversation feels natural.
- Ask open questions that start with “walk me through”, “what happens when”, “how do you know” or “show me”.
- Listen. Use short prompts such as “tell me more about that”.
- Close politely and say what happens next.
What is the difference between a closed and an open question?
| Closed or leading question | Better open question |
|---|---|
| Do you have a procedure for reporting hazards? | Walk me through what you do when you spot a hazard. |
| You wear your PPE all the time, don’t you? | What PPE do you use for this task, and how do you get it? |
| Were you trained on the emergency plan? | What would you do if the alarm sounded right now? |
| Is the near-miss system easy to use? | Tell me about the last near miss you reported. What happened next? |
The best audit question is the one the worker can only answer by describing what they really do.
How do you verify what workers tell you?
Check each statement against a second source, such as a record, an observation or another person.
An interview statement on its own is a lead, not proof. If a worker says they report hazards to their supervisor, ask to see the hazard log or the follow-up. If an operator describes the lockout steps, watch the task or compare with the procedure. Using 2 or more sources before you conclude is how you move from anecdote to evidence. Our guide to operational control in ISO 45001 shows where to look on the shop floor.
How do you record evidence?
Record specifics: who you spoke to, what they said or showed you, the document, the date and the place.
ISO 19011 guidance says audit evidence that leads to findings should be recorded. Capture facts, not impressions. “The operator said the guard was removed for cleaning on Tuesday, and the guard was missing at the line” is evidence. “The worker seemed unhappy” is not. Good notes make your findings easy to write. When you reach that stage, see our upcoming guide on writing the audit report, and our guide to incident investigation in ISO 45001 for another source of records to check.
Not sure whether to start as an internal or lead auditor? Compare the two roles in our guide.
What mistakes should auditors avoid in worker interviews?
The biggest mistakes are leading questions, talking too much and treating one comment as proof.
- Leading questions. “You do have a procedure, don’t you?” invites a yes.
- Interviewing only managers. They describe the system as designed, not as lived.
- Talking too much. The auditor’s job is to listen, not to explain the standard.
- Interviewing in front of a boss. Workers may hold back, so find a way to speak with them privately.
- Not verifying. One comment is not a finding until you have corroborated it.
For the wider skill set, see our guide on the skills you need to become an ISO 45001 auditor.
Interview simulation: choose the best response
For practice only. Read each situation and choose the best response. These scenarios were written by 3FOLD Training and are not real exam questions.
1 scenario answered: 1 of 1 correct
Preloaded example: Situation 1 is already answered. An open question that starts with “walk me through” makes the worker describe real practice, while a closed or leading question only invites a yes.
Frequently asked questions
How do you collect evidence in an ISO 45001 audit?
In an ISO 45001:2018 audit, auditors collect evidence through interviews, observation and review of documented information, according to ISO 19011 guidance. Only information that can be verified to some degree should be accepted as audit evidence, which is the approach expected of a CQI and IRCA ISO 45001 Lead Auditor.
Who should auditors interview in an ISO 45001 audit?
Auditors should interview people at several levels, including frontline workers, supervisors, managers and contractors, not only the OH&S manager. Clause 5.4 of ISO 45001:2018 covers worker consultation and participation, so worker interviews show whether it works in practice.
What questions should auditors ask workers in an ISO 45001 audit?
Auditors should ask open questions that begin with phrases such as walk me through, what happens when, how do you know, what would you do if and can you show me. These questions make workers describe real practice in an ISO 45001:2018 audit instead of giving a yes or no.
Why are open questions better than closed questions in an ISO 45001 audit?
Open questions make the worker explain what they really do, which gives more evidence than a yes or no. In an ISO 45001:2018 audit, closed or leading questions such as you have a procedure, don’t you, tend to produce answers that are short and hard to verify.
Can an interview statement alone be audit evidence in ISO 45001?
ISO 19011 guidance says only information that can be verified to some degree should be accepted as audit evidence. In an ISO 45001:2018 audit, a worker’s statement should be corroborated with records, observation or other people before it supports a finding.
How should auditors record interview evidence in an ISO 45001 audit?
Record specifics: who you spoke to, their role, what they said or showed you, the document or area involved, and the date and place. ISO 19011 guidance says audit evidence that leads to findings should be recorded, which supports the findings of a CQI and IRCA ISO 45001 Lead Auditor.
Do auditors speak directly to workers in an ISO 45001 audit?
Yes. Auditors speak directly to workers in an ISO 45001:2018 audit to understand how they report hazards, raise concerns and take part in OH&S activities. This is a key way to compare the documented system with real workplace practice.
Where 3FOLD Training fits
3FOLD Training is a CQI IRCA Approved Training Partner (ATP 6039853), licensed by the Knowledge and Human Development Authority (KHDA) in Dubai. The ISO 45001 Lead Auditor course is delivered as 40 hours of Virtual Instructor Led Training (VILT), with learning management system (LMS) access for recordings and mock exams, and you can check the next available batch on the course page. We prepare you for the exam; CQI and IRCA examine and certify. Before you book, read what you need in our eligibility guide.
Ready to audit with confidence? Check the next batch and see how exam application support works.
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