Why the Interview Is the Audit's Most Valuable Procedure
No other audit procedure gives the auditor access to what people actually think, what they are concerned about, and what they know is not working. Document review tells you what is supposed to happen. Systems testing tells you what did happen in a sample of transactions. Analytical procedures tell you where numbers deviate from expectation. The interview tells you why — and often surfaces issues that no other procedure would detect.
A skilled interviewer speaking with an operational manager for forty-five minutes will typically learn more about the real state of controls in a process than three days of document review. The challenge is that conducting an effective interview requires preparation, interpersonal skill, and disciplined technique — none of which is automatically developed by learning audit methodology.
Preparation: The Work Before the Interview
The quality of an audit interview is determined largely by the preparation done before entering the room. Auditors who arrive at an interview with a blank notepad and a list of generic questions will receive generic answers. Auditors who arrive having reviewed the relevant process documentation, prior audit reports, the interviewee's organisational role, and the specific risk and control questions the interview needs to answer will ask better questions and recognise significant answers when they hear them.
Pre-interview preparation should establish: what specific information this interview is designed to obtain; what is already known from documentation and prior work; what the key control questions are for this area; and what context about the interviewee's role and perspective might shape the conversation. An interview guide — not a rigid script, but a structured set of topic areas and key questions — provides the framework that keeps the conversation productive without constraining it.
Opening the Interview: Establishing Safety
The first two minutes of an audit interview determine whether the interviewee will give candid, substantive answers or carefully managed ones. Most people approach an audit interview with some degree of defensiveness — they are being assessed, and they are aware of it. The auditor's job in the opening is to reduce that defensiveness enough that genuine conversation becomes possible.
This is achieved through a combination of purpose clarity, relationship building, and explicit reassurance. Explain clearly what the audit is examining and why — not in formal audit language, but in plain terms that help the interviewee understand what you are trying to learn. Acknowledge their expertise in their own domain. Make clear that the purpose is to understand how the process works and where improvements might be possible — not to find fault or assign blame. These opening moves create the psychological safety that genuine answers require.
Questioning Technique: Open, Probe, Verify
Effective audit interviews follow a three-stage questioning cycle for each topic area. Open questions establish the landscape of the topic. Probing questions follow significant answers to understand them in depth. Verification questions confirm understanding and close potential gaps.
Open questions invite the interviewee to describe their experience and perspective without constraining the answer. "Walk me through how a vendor gets added to the system" is an open question. "Does the vendor approval process require two signatures?" is a closed question. Open questions produce far richer information — they reveal not just the answer but the interviewee's framing, priorities, and the details they consider important enough to mention.
Probing questions follow significant responses to pursue them in depth. When an interviewee mentions something potentially significant — an exception, a workaround, a recent change, a concern about a specific process — the skilled auditor pauses the prepared question list and explores. "You mentioned there are exceptions to that approval requirement — can you tell me more about what situations those cover?" The ability to recognise and pursue significant thread ends is the most important skill in audit interviewing.
Verification questions confirm that the auditor has correctly understood complex or ambiguous information. "So if I understand correctly, when the system generates a payment above $50,000, it automatically routes to the CFO for approval — is that right?" Verification questions prevent misunderstanding from becoming working paper error.
The most important skill in an audit interview is not asking questions — it is listening to answers. Auditors who are simultaneously formulating the next question while the interviewee is still answering the current one miss half of what is said. Active, unhurried listening is the foundation of effective interview technique.
Handling Resistance and Evasion
Not all interviewees are forthcoming. Some provide carefully managed answers designed to present their area in the most favourable light. Some are genuinely evasive. Some are simply uncomfortable with scrutiny. The auditor's response to resistance depends on its character.
For genuinely evasive answers — where the interviewee clearly knows more than they are sharing — the effective technique is patient persistence without aggression. Return to the topic from a different angle. Ask for specific examples or documentation. Acknowledge the sensitivity of the topic directly if that seems to be the source of reluctance. "I understand this might be a sensitive area — I want to be clear that I'm asking because understanding the full picture helps me give management accurate information about what needs attention."
For carefully managed answers — where the interviewee is presenting a positive picture that may not reflect reality — the most useful technique is the hypothetical question. "If a payment did get through without the required approval, what would be the mechanism by which that could happen?" Hypothetical questions invite the interviewee to discuss risks and weaknesses in an abstract frame that feels less threatening than direct questions about specific failures.
Closing and Documentation
The closing of an audit interview should always include an open invitation for the interviewee to raise anything not yet covered: "Is there anything about how this process works, or any concerns you have, that we haven't discussed that you think would be useful for me to know?" This question consistently surfaces information that the auditor's prepared questions would not have reached — because the interviewee has something significant on their mind that was not on the agenda.
Working paper documentation of interview results should capture not just the factual content of answers but the auditor's observations about the interviewee's confidence, consistency, and any apparent areas of concern or evasion. These qualitative observations are often as important as the factual record in directing subsequent audit procedures.