Why the Interview Is the Heart of Every Audit
Documents tell you what an organisation says it does. Interviews tell you what actually happens. That gap between the two is where most nonconformities live, and skilled interview technique is what closes it.
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Every auditor learns to review procedures and sample records. Far fewer learn to ask questions in a way that gets people talking honestly. Yet the interview is often the most powerful evidence gathering tool available. A well run conversation with a process owner or shop floor worker can surface issues that no checklist would ever find.
This article covers practical interview techniques for auditors at every level, from internal auditors running their first programme to lead auditors conducting certification audits. The principles apply across ISO 9001, ISO 14001, ISO 45001, and any other management system standard.
Preparing for the Interview Before You Walk In
Good interviews start well before you sit down with the auditee. Preparation shapes the quality of every question you ask.
Know What You Are Trying to Find Out
Before each interview session, be clear on your audit objectives for that process. What are you trying to confirm or explore? Are you checking whether competence requirements are being met? Whether environmental aspects have been identified correctly? Whether hazard identification is genuinely ongoing?
Write three to five focus areas for each interview. These are not rigid questions to be read out in sequence. They are anchors that keep you on track when the conversation wanders. Without them, it is easy to finish an interview feeling like you covered a lot of ground but actually verified very little.
Review the Process Before You Ask About It
Read the relevant procedure, work instruction, or process description before the interview. Understand what the system says should happen. This gives you a baseline to compare against what the person actually describes. It also helps you spot inconsistencies without having to reference documents mid conversation, which can make people defensive.
If you are auditing a process you have never seen before, spend extra time on this preparation. You do not need to be a technical expert, but you do need enough context to ask sensible questions and recognise unusual answers.
Plan Your Opening, Not Just Your Questions
How you open an interview sets the tone for everything that follows. A cold, formal start puts people on guard. A brief, human introduction that explains what you are doing and why tends to produce far more useful conversations. More on this below.
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Opening the Interview: Setting the Right Tone
Most people find being interviewed by an auditor at least slightly uncomfortable. They worry about saying the wrong thing, getting their team in trouble, or being judged. Your job in the first two minutes is to reduce that anxiety enough that they can speak honestly.
Introduce Yourself and Explain the Purpose
Start by telling the person who you are and what the interview is for. Keep it simple. Something like:
I am here to understand how this process works in practice. I am not testing you personally. I just want to hear how things actually happen day to day, including anything that does not always go smoothly.
That last sentence matters. Explicitly giving people permission to mention problems makes it much more likely they will. Many auditees assume auditors only want to hear that everything is perfect. Correcting that assumption early changes the entire dynamic.
Confirm Timing and Ask If They Have Questions
Let the person know roughly how long the interview will take. Ask if they have any questions before you start. This small courtesy signals respect and tends to put people at ease. It also surfaces any concerns early, such as a worker who is worried about confidentiality, which you can address before you begin.
The Core Questioning Techniques
The questions you ask determine the quality of evidence you collect. Experienced auditors use a range of question types deliberately, moving between them depending on what they need.
Open Questions: The Foundation of Audit Interviewing
Open questions cannot be answered with yes or no. They invite the person to explain, describe, and elaborate. They are the workhorses of audit interviewing because they produce narrative answers that reveal how things actually work.
Examples include: Tell me how you handle a customer complaint when one comes in. Or: Walk me through what happens when a new chemical arrives on site. Or: Describe the last time something went wrong in this process and what you did about it.
Notice that these questions ask for specific, concrete descriptions rather than general statements. Tell me about your complaint process tends to produce a recitation of the procedure. Tell me about the last complaint you dealt with produces a real account of what actually happened, which is far more useful.
Probing Questions: Going Deeper Without Pressure
Once someone has given you an initial answer, probing questions help you understand it more fully. They follow up on what was just said rather than introducing a new topic.
Common probing approaches include asking for an example, asking what happened next, asking who else is involved, and asking what the person does when something does not go according to plan. These questions signal genuine interest and encourage the person to keep talking.
The key is to probe without interrogating. There is a real difference between a curious follow up question and a pointed challenge. Can you show me an example of that? feels collaborative. So you are saying that never fails? feels adversarial. Both might be aimed at the same gap, but only one will keep the conversation productive. You can find more detail on this in our article on probing questions for auditors.
Closed Questions: Using Them at the Right Moment
Closed questions produce yes or no answers, or short factual responses. They are useful for confirming specific facts, pinning down dates, or clarifying a detail. Is that procedure reviewed annually? Or: Was the training completed before the employee started in the role?
The mistake new auditors make is relying on closed questions too heavily. A string of closed questions feels like an interrogation and produces very thin evidence. Use them to confirm or clarify, not to explore.
The Funnel Technique: Moving from Broad to Specific
One of the most effective structures for an audit interview is the funnel. You start with a broad open question to understand the process generally, then progressively narrow your focus toward specific details or areas of concern.
For example, you might start with: Tell me about how you manage your environmental aspects in this area. After the initial answer, you might narrow to: How do you identify new aspects when a process changes? Then narrower still: Can you walk me through a recent change and show me how the aspects register was updated?
This approach feels natural to the auditee because it mirrors how a normal conversation develops. It also gives you a logical path from general understanding to specific evidence.
Using Silence Deliberately
Silence is an underused technique. When someone finishes an answer, many auditors immediately ask the next question. If you wait a few seconds instead, the person often continues, adding detail or context they might not have volunteered otherwise.
Silence also gives you time to think. It is far better to pause and consider your next question than to rush to fill the gap with something unhelpful. Comfortable silence signals confidence and attentiveness. Rushed questions signal that you are following a script rather than genuinely listening.
Active Listening: The Skill That Makes Everything Else Work
Asking good questions is only half the job. The other half is listening carefully enough to use the answers well.
Listen for What Is Not Said
Experienced auditors pay attention to gaps and hesitations as much as to the content of answers. When someone describes a process fluently up to a certain point and then becomes vague or changes the subject, that transition is worth noting. It often signals an area where practice does not match procedure.
Similarly, listen for qualifiers. We usually do it that way is different from we always do it that way. Most of the time the records are completed on the day is worth following up. These hedging phrases are often the most honest things people say in an audit interview.
Take Notes Without Breaking the Flow
You need to record what you hear, but constant note taking can disrupt the conversation and make people feel they are being documented rather than heard. Find a balance. Jot key points, specific examples, and direct quotes when they matter. Do not transcribe everything. Your notes should capture enough to support your findings, not a verbatim record of the conversation.
If someone says something significant, it is acceptable to pause briefly and say: Let me just note that down. Most people understand and appreciate the transparency.
Reflect Back What You Have Heard
Periodically summarising what the person has told you serves two purposes. It confirms your understanding and it signals to the auditee that you have been listening. Something like: So if I understand correctly, the inspection is done by the operator but the record is not completed until the end of the shift, is that right?
This technique also catches misunderstandings early, before they become the basis for an incorrect finding.
Interviewing Different Types of People
Not every auditee responds the same way. Adapting your approach to the person in front of you is one of the marks of an experienced auditor.
Interviewing Workers on the Floor
Workers at the operational level are often the most valuable source of evidence about what actually happens in practice. They are also sometimes the most guarded, particularly if they are worried about getting colleagues into trouble or if they have had negative experiences with audits in the past.
Keep your language simple and jargon free. Do not ask a machine operator whether the organisation has addressed its significant environmental aspects. Ask: What do you do if you notice a chemical spill in this area? Or: How do you know what to do if there is an emergency? The answers will tell you everything you need to know about whether the management system is actually working at the operational level.
Interviewing Managers and Process Owners
Managers tend to be more comfortable in interview situations and more practised at giving polished answers. The risk here is that you get a description of what the system is supposed to do rather than evidence of what it actually does.
Push for specifics. When a manager tells you that corrective actions are always followed up within 30 days, ask to see the register and pick a few examples to verify. When they say training needs are assessed annually, ask who conducted the last assessment and what came out of it. Specifics are where the evidence lives.
Interviewing Top Management
Interviews with senior leaders are often shorter and more formal. Your focus here is on demonstrating leadership and commitment, strategic context, and resource allocation rather than operational detail. Ask about how they stay informed about the performance of the management system, what decisions they have made recently based on that information, and how they communicate the importance of the system to their teams.
Be direct but respectful. Senior leaders generally appreciate an auditor who gets to the point. Avoid lengthy preambles and stick to questions that only they can answer. There is a detailed guide on this in our article about how to audit top management without losing the room.
Handling Difficult Interview Situations
Even well prepared auditors encounter situations that require careful handling.
When the Auditee Is Defensive
Some people become defensive when audited, particularly if they feel their competence or their team is being questioned. The most effective response is to stay calm, keep your tone genuinely curious rather than critical, and redirect toward the process rather than the person.
Phrases like I am just trying to understand how this works in practice or Help me understand what happens when that occurs are useful because they frame you as someone trying to learn rather than someone looking for problems. If defensiveness persists, it is sometimes worth acknowledging it directly: I can see this feels a bit uncomfortable. That is completely understandable. I am not here to find fault with you personally.
When You Get Vague or Evasive Answers
Vague answers are sometimes a sign that the person does not know, sometimes that they are being careful, and sometimes that there genuinely is no system in place. Your job is to distinguish between these possibilities.
Ask for a specific example. If they cannot give one, ask why. If they say the example is documented somewhere, ask to see it. Following the evidence from the interview into the records is one of the most effective ways to test whether a system actually exists or only exists on paper.
When the Interview Reveals a Significant Issue
Sometimes an interview surfaces something serious. A worker describes a practice that clearly contradicts a critical procedure. A manager reveals that a required activity has never actually been done. When this happens, stay composed. Do not react with alarm or make pronouncements about nonconformities mid interview.
Note what you have heard, ask follow up questions to make sure you have understood correctly, and seek corroborating evidence before drawing conclusions. One person's account, however credible, is rarely sufficient on its own to raise a finding. Triangulate with documents and observation wherever possible.
Closing the Interview Properly
How you close an interview matters almost as much as how you open it. A good close leaves the auditee feeling respected and gives you a final opportunity to gather anything you missed.
Summarise the key points you have taken from the conversation. Ask if there is anything the person would like to add or anything they think you should know about the process that you have not covered. Thank them genuinely for their time. These steps take less than two minutes and make a real difference to the experience of being audited.
If you have identified areas you want to follow up on, let the person know you may come back to them. This is courteous and prevents surprises later in the audit.
Exemplar Global Recognised Training ProviderRTP No. 310970Connecting Interview Evidence to Your Audit Findings
Interview evidence needs to be connected to other evidence types to be robust. A statement from one person, even a very credible one, is not sufficient on its own to raise a nonconformity. Cross reference what you hear in interviews against records, documents, and your own observations on the floor.
When you write up your findings, be specific about the evidence base. Note who you spoke to, what they told you, and how that connects to the documented requirement and any supporting or contradicting records. Vague findings that reference “interviews conducted during the audit” without specifics are much harder to defend and much less useful for driving improvement.
For more on this, see our guide on how to gather audit evidence that stands up to scrutiny.
Building Interview Skills Over Time
Interview technique improves with deliberate practice. After each audit, reflect on the conversations you had. Which questions produced the most useful responses? Where did you miss an opportunity to probe further? Were there moments where you talked too much and listened too little?
Seeking feedback from auditees is also valuable, though not always easy to arrange. When it is possible, even a brief informal conversation at the end of an audit about how the process felt from the auditee's perspective can surface useful insights.
Reading about questioning and listening techniques from fields beyond auditing, such as investigative journalism, clinical interviewing, and qualitative research, can also sharpen your skills in ways that standard auditor training does not always cover.
If you are looking to build a solid foundation in audit interviewing alongside the full range of audit skills, the courses at Audit Workshop cover practical interview technique as part of both the Internal Auditor and Lead Auditor programmes across ISO 9001, ISO 14001, and ISO 45001. The training is grounded in real audit practice, not just theory, and includes worked scenarios that let you practise questioning techniques before you apply them in the field.
