Why the way you interview matters

An internal investigation stands or falls on the quality of its evidence, and witness accounts are often the most important part of that picture. A witness who feels rushed, ambushed or disbelieved will give you a defensive, partial version of events — and once an interview has gone badly, it is very difficult to recover. Get the tone right, however, and people tend to be surprisingly willing to tell you what they saw, even when the subject is uncomfortable.

The aim is a calm, neutral conversation that gathers facts. You are not there to accuse, to persuade or to reach a view. You are there to understand what the witness knows, in their own words, and to record it accurately enough that someone else could rely on it later.

Prepare before you walk in the room

Preparation is where most interviews are won or lost. Before you speak to anyone, read the relevant documents — the complaint, emails, policies, rota sheets, system logs — and build a timeline of what you already know. That lets you spot gaps rather than waste time confirming things you can verify elsewhere.

• List the topics you need to cover, in a logical order, rather than writing a fixed script. Scripts make people sound robotic and encourage you to ignore the very answers you need to follow up.
• Draft open questions for each topic — "Tell me what happened on the afternoon of the 14th", "How was that decision reached?", "What did you notice at the time?".
• Check for leading phrasing and rewrite it. "Did you see him take the money?" invites a particular answer; "What did you see?" does not.
• Think about logistics: a private room, no interruptions, enough time, and a note-taker if your policy allows. If you are taking notes yourself, expect the interview to run longer.

Explain the process at the start

A short, honest introduction settles nerves and makes the whole exercise feel fairer. Cover the basics before you ask a single substantive question:

• Who you are and what your role is in the investigation.
• Why they have been asked to speak to you and what the investigation is broadly about.
• That you are gathering information, not drawing conclusions, and that no decision has yet been made.
• How their account will be recorded, who may see it, and the limits of confidentiality.
• That they should stick to what they personally saw, heard or did — and say so clearly when they are passing on what someone else told them.
• That they can ask for a break, take their time, and ask you to repeat or clarify a question.

If your organisation's policy gives witnesses a right to be accompanied, explain that up front too, so nobody feels the offer was buried later.

Ask open questions and then listen

Begin with broad, open questions and use silence deliberately. Most people will fill a pause, and what they add is often the most useful part of the account. Resist the urge to jump in with your own theory of events.

• Follow the funnel: start wide, then narrow in on times, places, names and sequences.
• Probe with open prompts: "What happened next?", "How do you know that?", "Who else was there?", "What did you make of it at the time?".
• Separate fact from impression. "You have described what you saw — is that something you witnessed yourself, or something you were told?"
• Don't argue or correct. If an account conflicts with a document, note the discrepancy and explore it neutrally later, ideally by showing the document and asking for their comments.
• Manage emotion without dismissing it. Acknowledge distress, offer a pause, and carry on gently. An upset witness can still give reliable evidence if they feel safe.

Record the account accurately

Your notes may end up in a disciplinary hearing, a grievance appeal or an employment tribunal. Accuracy, not polish, is the goal.

• Write in the first person where you can — "I saw…", "I thought…" — and keep the witness's own wording for key phrases.
• Distinguish clearly between what they saw, what they were told and what they assumed.
• Note the date, time, location, attendees and duration at the top of your record.
• Avoid adjectives and conclusions of your own. "He seemed nervous" is your impression; "he paused for several seconds before answering" is an observation.
• Read the notes back, or provide a typed statement for the witness to check, correct and sign. Where they disagree with your wording, change it.
• Store everything securely and share it only with those who genuinely need it.

Close carefully and follow up

Finish by asking whether there is anything else they think you should know, and whether they would be willing to be contacted again if further questions arise. Explain what happens next, without promising an outcome or a timescale you cannot control. Remind them of the confidentiality position and ask them not to discuss their evidence with other witnesses, which protects the integrity of the process rather than silencing anyone.

Write up your notes the same day, while your memory of tone and hesitation is still fresh, and flag any inconsistencies or gaps for follow-up. A well-run witness interview is unglamorous work — patient, methodical and deliberately neutral — but it is usually the difference between an investigation that holds up and one that collapses under scrutiny.