How to Write a Workplace Investigation Report
A practical guide to structuring and writing a workplace investigation report that will withstand scrutiny from tribunals, courts, and senior decision-makers.
Why the report is the most important document in any investigation
The investigation report is the permanent record of everything that happened. If the respondent lodges an unfair dismissal application, a General Protections claim, or pursues judicial review, your report is the key exhibit. A well-written report demonstrates that the process was fair, the evidence was weighed carefully, and the findings are rational. A poorly written report can unravel an otherwise sound investigation.
Who is the audience?
Write the report for the decision-maker, not yourself. The decision-maker may be a CEO, board member, or HR director who was not present for any interviews. They need to be able to read the report and understand:
- What was alleged
- What evidence was gathered and from whom
- What findings were made and why
- What recommendations, if any, are being made
Avoid investigation jargon. Write clearly. Use plain English. The report may also be read by legal counsel, a tribunal member, or a judge, so write accordingly.
Standard report structure
1. Executive Summary
A one-page summary of the allegations, process, findings, and any recommendations. Busy decision-makers read this first; make it standalone.
2. Background and Terms of Reference
What triggered the investigation? Who appointed the investigator? What was the scope? Attach the formal terms of reference if one was issued.
3. Investigative Process
List every step taken: documents reviewed, interviews conducted (with dates), site visits, and any other steps. This section proves you ran a thorough process.
4. Summary of Evidence
Present each witness's evidence in summary form. Do not copy-paste interview transcripts; synthesise the relevant content. Note any contradictions between accounts.
5. Findings
Address each allegation separately. State the finding (substantiated / not substantiated / inconclusive), then set out the reasoning. Cite specific evidence. Explain why you preferred one account over another where evidence conflicted.
6. Recommendations (if applicable)
Whether this section is included depends on the nature of the engagement. An internal investigator, such as an HR manager or in-house counsel, will often include recommendations for remedial action: training, policy review, or referral to a decision-maker for a disciplinary process. An independent external investigator should generally stop at findings and leave all recommendations to the organisation. Including recommendations when engaged externally can compromise perceived independence and may put the investigator in an awkward position if their recommendations are not adopted. If recommendations are included, they should be clearly framed as advisory only and should not purport to determine the appropriate disciplinary outcome.
7. Appendices
Attach the key documents: terms of reference, signed witness statements, key emails or records referred to in findings.
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Writing findings that will withstand challenge
The findings section is where most reports fall down. Avoid these common errors:
- Conclusory statements: "We find the allegation is substantiated" with no reasoning is not a finding; it is simply a conclusion. Show your work.
- Credibility findings without explanation: If you preferred one witness over another, explain why. Was one account internally consistent? Was one corroborated by contemporaneous documents?
- Conflating facts and inferences: Be clear when you are drawing an inference from proven facts. "We infer from the CCTV footage and access records that the respondent was in the building at the relevant time" is sound. "The respondent was clearly lying" is not.
- Hearsay: Distinguish between direct evidence (the witness saw or heard the conduct) and hearsay (the witness was told about it by someone else). Both can be considered, but hearsay is less reliable.
Tone and language
- Use the past tense throughout
- Refer to individuals by their role (the Complainant, the Respondent, Witness A) unless there is a reason to use names
- Avoid language that implies a finding before you reach the findings section
- Do not use emotive language ("despicable conduct", "obviously lying"), as it undermines credibility
- Proofread for consistency: make sure names, dates, and titles are consistent throughout
Confidentiality and retention
The report is a confidential document. It should only be shared with the decision-maker, legal counsel, and others on a need-to-know basis. Under the Privacy Act 1988 (Cth), you have obligations to protect the personal information of everyone named in the report.
Retain investigation records for at least 7 years, or longer if litigation is ongoing or reasonably anticipated. Some organisations retain serious misconduct investigation records indefinitely.