Audit interviewing is the skill that separates average auditors from genuinely effective ones. You can have the most thorough checklist in the room, but if you cannot get people talking honestly, you will miss what actually matters. Whether you are conducting an internal audit, a supplier audit, or a third party certification audit, the quality of your interviews determines the quality of your evidence. This guide covers the core audit interviewing techniques every auditor should have in their toolkit, with practical advice drawn from real audit situations.
On this page
Why Interviewing Is the Heart of Audit Evidence Gathering
Documents tell you what an organisation says it does. Interviews tell you what it actually does. That gap between the two is often where nonconformities live.
ISO 19011 identifies interviewing as one of the primary methods for collecting audit evidence, alongside document review and observation. In practice, interviews tend to be the most revealing of the three. A procedure might look perfectly written on paper, but a five minute conversation with the person who follows it every day will quickly reveal whether it reflects reality or just the quality manager's aspirations.
New auditors often underestimate how much skill interviewing requires. They assume that asking questions is straightforward. It is not. Getting someone to speak openly in an audit context, where they may feel assessed or threatened, takes deliberate technique. The good news is that these techniques are learnable, and with practice they become second nature.
Exemplar Global Recognised Training ProviderRTP No. 310970
Setting the Right Tone Before You Ask Anything
The quality of your interview begins before you ask your first question. How you introduce yourself, how you explain the purpose of the audit, and how you physically position yourself in the room all shape whether the person in front of you will open up or shut down.
Build Rapport Quickly
You do not need to spend ten minutes on small talk. A brief, genuine acknowledgement of the person's role goes a long way. Something like acknowledging that they are the one who actually runs this process day to day, and that you are here to understand how it works, signals that you are curious rather than adversarial.
Avoid starting with a list of requirements or clauses. That immediately puts people on the defensive. Start with their work, their role, and what they do. The compliance questions follow naturally from there.
Explain What You Are Doing and Why
Many auditees, particularly shop floor workers or people who have never been audited before, are genuinely unsure what an audit is. They may assume it is a performance review or that they are personally being evaluated. Take thirty seconds to clarify that you are auditing the system, not the person. This simple clarification reduces anxiety significantly and produces better, more honest responses.
The Core Questioning Techniques
Experienced auditors use a range of question types deliberately, moving between them based on what the conversation needs at any given moment.
Open Questions: Getting People Talking
Open questions are the foundation of effective audit interviewing. They invite explanation rather than a yes or no answer, and they give the auditee the opportunity to tell you how things actually work.
Examples include:
- Can you walk me through what happens when a nonconforming product is identified?
- How do you decide which suppliers to use for this type of work?
- What happens if a customer raises a complaint?
The value of open questions is that you often learn things you did not think to ask about. The auditee's answer reveals the actual process, which may differ from the documented procedure in ways that are either better or worse than what is written. Both are worth knowing.
For a deeper look at how to structure open questions in an audit context, see our article on open questions in auditing.
Probing Questions: Following the Thread
Open questions start the conversation. Probing questions deepen it. When an auditee gives you an answer that is vague, incomplete, or that raises a flag in your mind, a probing question pushes further without putting the person on the spot.
Useful probing approaches include:
- Clarification: Can you tell me a bit more about how that decision gets made?
- Elaboration: You mentioned the supervisor approves that. What does that approval look like in practice?
- Evidence: Where would I find a record of that?
- Example: Can you give me a recent example of when that happened?
The evidence and example probes are particularly powerful. Asking for a recent example grounds the conversation in reality. If someone claims a process happens consistently but cannot point to a single recent instance, that tells you something important.
The Funnel Technique: From Broad to Specific
One of the most effective interview structures for auditors is the funnel approach. You start broad, with an open question about the overall process, then gradually narrow the focus with probing questions until you reach the specific evidence you need.
For example, when auditing a training process:
- Start broad: How does the organisation identify what training people need?
- Narrow down: How is that documented?
- Get specific: Can you show me how that was applied for someone who started in the last three months?
This approach feels natural to the auditee because it mirrors normal conversation. It also ensures you move from understanding the system to verifying it with evidence, which is exactly what an audit requires.
Closed Questions: Confirming Facts
Closed questions have a bad reputation in interviewing guides, but they have a legitimate place in audit interviews. Use them to confirm specific facts, clarify something ambiguous, or wrap up a line of questioning.
Examples:
- So the calibration records are kept in the maintenance system, is that right?
- Is this procedure reviewed annually?
The risk with closed questions is overusing them. If your interview consists mostly of closed questions, you are essentially conducting a checklist exercise rather than a genuine conversation. You will get yes and no answers, and you will miss the context that reveals whether the system is actually working.
Silence as a Tool
This one surprises new auditors. Silence, used deliberately, is one of the most effective interviewing techniques available. When an auditee finishes an answer, resist the urge to immediately ask the next question. Wait. Count to three in your head if you need to.
What often happens is that the auditee fills the silence with additional information, qualifications, or corrections to what they just said. That additional information is frequently the most revealing part of the interview. People tend to say what they think you want to hear first, and then, in the silence, add what is actually true.
Interviewing Different Types of Auditees
Not every interview is the same. The techniques you use with a senior manager differ from those you use with a warehouse operator or a contractor on site. Adjusting your approach based on who you are talking to is a mark of an experienced auditor.
Interviewing Top Management
Managers are generally comfortable talking. The challenge is keeping the conversation grounded in evidence rather than policy statements and aspirations. When a manager tells you that safety is a top priority, your job is to find out what that looks like in practice.
Questions like How do you know the system is working? and What was the last significant issue raised through the audit programme, and what did you personally do about it? cut through the rhetoric and get to real evidence of leadership engagement.
Interviewing Shop Floor Workers
Workers on the floor are often the most honest interviewees in a building, provided they feel safe to speak. They will tell you exactly how things work, including the workarounds, the shortcuts, and the things that are supposed to happen but do not.
The key with shop floor interviews is to use simple, jargon free language. Ask about their actual daily tasks rather than system requirements. What do you do when you find a product that does not look right? will get you far more useful information than Can you describe your nonconforming output process?
For more on this, see our dedicated guide on interviewing shop floor workers.
Interviewing Defensive or Anxious Auditees
Some auditees are visibly nervous. Others become defensive when they sense the interview is heading toward a finding. Both situations require patience and a deliberate shift in your approach.
For anxious auditees, slow down. Ask simpler questions. Acknowledge their expertise. Remind them that you are trying to understand the process, not catch them out.
For defensive auditees, stay factual and calm. Do not argue. Do not push harder. If someone is becoming resistant, redirect to a different area and come back to the sensitive topic later, or approach it from a different angle. The goal is evidence, not confrontation.
Active Listening: The Skill Most Auditors Underestimate
Asking good questions is only half of interviewing. The other half is listening properly. Active listening means paying full attention to what is being said, noticing what is not being said, and demonstrating to the auditee that you are genuinely engaged with their answers.
In practice, active listening involves:
- Maintaining appropriate eye contact rather than looking at your checklist while someone is speaking
- Nodding and using brief acknowledgements to show you are following
- Paraphrasing back what you have heard to confirm understanding: So if I understand correctly, the approval happens before the work starts, not after?
- Noting inconsistencies between what someone says and what you have already seen in documents or observations, and following up on them
Auditors who are too focused on their checklist miss the conversational cues that point toward findings. A slight hesitation, a change in tone, or a vague answer to a specific question are all signals worth pursuing.
Note Taking During Interviews
You need to take notes. You also need to maintain a genuine conversation. These two things are in tension, and managing that tension is a practical skill.
A few principles that work well in practice:
- Write brief notes, not verbatim transcripts. You need key facts, names, dates, record references, and direct quotes where they are significant.
- Tell the auditee you will be taking notes and that it is normal practice. This prevents them from becoming unsettled when you write something down.
- If something important is said, it is acceptable to pause and say: Let me just note that down. Auditees generally respect this.
- Review and expand your notes immediately after the interview, while the detail is still fresh.
If you are conducting a remote audit by video call, note taking is somewhat easier because you can keep notes on screen without it affecting the conversation dynamic in the same way.
Common Interview Mistakes and How to Avoid Them
Even experienced auditors fall into patterns that reduce the effectiveness of their interviews. Being aware of these habits is the first step to correcting them.
Asking Leading Questions
A leading question contains the answer within it. You do review this procedure annually, don't you? invites agreement rather than honest disclosure. Rephrase it as: How often is this procedure reviewed, and when was it last reviewed?
Accepting Vague Answers
When someone says we usually do that or that normally gets checked, do not move on. Those qualifiers are flags. Usually and normally suggest inconsistency. Follow up: Can you show me an example from the last month where that happened?
Talking Too Much
Some auditors fill silence with their own commentary, explain their questions at length, or share their own opinions about how things should work. This is counterproductive. Your job is to listen. A good rule of thumb is that the auditee should be speaking for at least seventy percent of the interview.
Telegraphing Your Findings
Avoid giving signals during the interview that you have already reached a conclusion. If an auditee senses that you have made up your mind, they will either become defensive or simply stop engaging. Maintain a neutral, curious posture throughout, even when you have found something significant.
Structuring Your Interview Time
A typical process interview in an internal audit might run for twenty to forty minutes. In a certification audit, individual interviews may be shorter because the auditor is moving through multiple areas. Either way, having a loose structure helps you cover what you need without making the conversation feel like an interrogation.
A practical structure:
- Introduction (two to three minutes): Introduce yourself, explain the purpose, and put the person at ease.
- Process overview (five to ten minutes): Open questions about the process, role, and responsibilities.
- Targeted enquiry (ten to twenty minutes): Probing questions following up on areas of interest, with requests for records and evidence.
- Wrap up (two to three minutes): Summarise what you have covered, thank the person, and let them know what happens next.
The wrap up is worth taking seriously. Thanking the auditee and briefly explaining next steps leaves them with a positive impression of the process, which matters for the organisation's ongoing engagement with the audit programme.
Exemplar Global Recognised Training ProviderRTP No. 310970Triangulating Interview Evidence
No single interview should be the sole basis for an audit finding. Good audit practice involves triangulating evidence across multiple sources: what people say in interviews, what documents show, and what you observe on the ground.
If an interview suggests a process is not being followed consistently, look for corroborating evidence in records before raising a finding. Equally, if documents and observations already point toward a gap, an interview with the relevant person can confirm the picture and provide the context needed to write a meaningful nonconformity report.
This triangulation approach is described in detail in our article on gathering audit evidence: sampling, interviews and document review done well.
Building These Skills Through Practice and Training
Audit interviewing is not something you master by reading about it. It requires practice, feedback, and exposure to a range of auditee types and situations. The most effective way to develop these skills quickly is through structured training that includes role plays, simulated audits, and feedback from experienced practitioners.
At Audit Workshop, interviewing techniques are a core component of both our Internal Auditor and Lead Auditor courses across ISO 9001, ISO 14001, and ISO 45001. Our courses are built around practical audit scenarios, not just theory, because the skills that matter in a real audit room are the ones you develop by actually practising them. Whether you are preparing for your first internal audit or working toward lead auditor certification, our training gives you the interviewing foundation you need to conduct audits with confidence.
You can explore our available courses at auditworkshop.com.
