An investigation interview should help the investigator understand what happened, how the person knows it, what records may exist, and what further inquiry is reasonable. It should not be used to pressure a witness into adopting the investigator’s theory.
1. Begin with the interview’s purpose
Before inviting anyone, identify why their information may matter. Connect the interview to one or more neutrally worded allegations, disputed facts, chronology questions, or evidence gaps. An interview should not be scheduled merely because someone appears on a broad employee list.
Record the person’s expected role without assuming what they will say. They may be a complainant, respondent, direct witness, contextual witness, custodian of records, supervisor, policy owner, or person identified during another interview. Those labels help organize the plan, but they do not determine credibility.
- What material question might this person help answer?
- What direct knowledge might they have?
- What information has already been attributed to them?
- Which documents or events should be reviewed before the meeting?
- What must remain outside the approved scope?
2. Choose an interview sequence that supports fairness
There is no universal order for every case. A common starting point is to understand the initial concern, then speak with people who may preserve or clarify time-sensitive facts, and ensure the respondent has a meaningful opportunity to answer the material allegations. The sequence may change when evidence is at risk, a witness is leaving, safety concerns exist, or early information reveals a better path.
Avoid treating the sequence as a verdict. Interviewing one person first does not make that account more reliable. Document why material sequencing decisions were made, especially when a planned interview is delayed, omitted, repeated, or conducted through an alternative arrangement.
3. Prepare topics, not a rigid interrogation script
A topic plan creates consistency without preventing useful follow-up. Begin with open prompts that invite the person’s account, then narrow the discussion to dates, locations, words, actions, people present, contemporaneous records, and how the person knows each fact.
Separate direct observation from inference, opinion, workplace rumor, and information learned from someone else. When a person refers to a document, message, photograph, recording, schedule, policy, or other witness, record enough detail to support a lawful follow-up request.
Do not place every internal prompt into an invitation or hand a witness the investigator’s full analysis. Provide the notice and information required by applicable rules while protecting unnecessary personal information and the integrity of unfinished inquiry.
4. Make clear and fair meeting arrangements
Give reasonable notice and explain the purpose, date, time, location or video platform, anticipated participants, and any applicable right or organizational practice concerning accompaniment or representation. Consider accessibility, disability-related adjustments, language assistance, location, scheduling, safety, and the effect of workplace relationships.
Plan how notes will be taken and whether recording is permitted. Do not assume a recording is lawful or appropriate. Acas advises that recording should be agreed by all parties when an organization’s policy allows it. Explain confidentiality honestly: information may need to be shared with people who require it for the investigation or decision, so absolute secrecy should not be promised.
5. Conduct a neutral, understandable meeting
At the beginning, identify everyone present, explain the investigator’s role, describe the purpose of the meeting, address confidentiality and retaliation expectations, and explain how notes or statements will be handled. Confirm that the person understands and can participate.
Let the witness finish meaningful answers. Ask one clear question at a time, avoid argumentative wording, and test important details respectfully. If an answer changes, ask what caused the change instead of assuming dishonesty. If a question cannot be answered, record that accurately rather than filling the gap with an inference.
- Clarify approximate and exact dates rather than treating them as interchangeable.
- Ask who was present and where each person was positioned.
- Distinguish words remembered from a witness’s later summary of their meaning.
- Ask about records created at or near the time.
- Invite information that does not fit the investigator’s current understanding.
- End by asking what else matters and who else may hold relevant information.
6. Preserve the account without silently rewriting it
Interview notes should identify the case, person, participants, date, time, method, and note taker. Keep factual statements distinguishable from investigator observations and later analysis. If a witness reviews a statement or summary, record what was provided, when it was provided, what corrections were requested, and how confirmation was received.
Do not overwrite an original statement merely to make it cleaner. Preserve material corrections with a visible explanation and date. Store relevant attachments, messages, and documents with source information so the final report can trace important conclusions back to the record.
7. Turn each interview into controlled follow-up
After the meeting, identify new witnesses, evidence requests, contradictions, chronology changes, scope questions, and topics that may require a return interview. Assign responsibility and a due date to each necessary follow-up rather than leaving it buried in narrative notes.
Review the developing record allegation by allegation. A new lead should be pursued because it is material, not because it is interesting. If it falls outside scope, document the referral or scope decision rather than quietly expanding the investigation.
Common interview-planning mistakes
- Inviting a witness without knowing what issue the interview may address.
- Using leading questions before obtaining the person’s own account.
- Ignoring evidence that could challenge the initial allegation.
- Promising confidentiality that cannot be guaranteed.
- Failing to consider representation, accessibility, or language needs.
- Keeping names, invitations, notes, documents, and follow-up in unrelated files.
- Editing a statement without preserving what changed and why.
- Leaving new evidence requests inside notes with no owner or due date.
Prepare the record before the first question
Use the Blank Witness Statement Form and The First 24 Hours Checklist to support organized preparation. No purchase, account, or email address is required.
Sources and further reading
- Acas: Holding investigation meetings
- Acas: If there are witnesses
- U.S. EEOC: Employer liability and harassment investigations
Turn interview plans into a connected investigation record
WorkplaceFindings Professional keeps parties, witnesses, allegations, interview plans and notes, collected evidence, follow-up tasks, findings, corrections, audit history, and Word or PDF reports inside the selected secured case.