How to Plan a Fair Workplace Investigation

A workplace investigation is a structured fact-finding process used when an employer must decide what happened and what policy or obligation may apply. It should begin with defined allegations and an impartial investigator—not with a preferred outcome.

Check the correct legal and policy route

Some matters have a specific framework. Sexual-harassment complaints by women at the workplace fall under the 2013 Act and its Internal Committee or Local Committee process; the SHe-Box system may also be relevant. Safety, whistleblowing, fraud, industrial relations or criminal allegations may require specialist handling. A generic investigation checklist must not override these routes.

Write terms of reference

State the allegations or questions, relevant period, policies, investigator, decision-maker and expected report. Keep scope narrow enough to complete fairly. If new material suggests another allegation, document and communicate the scope change rather than quietly investigating it.

Assess interim risk

Consider safety, retaliation, evidence loss, influence over witnesses and operational continuity. Possible measures include preserving records, changing reporting contact or restricting particular access. Interim action is not a finding and should be reviewed for proportionality.

Plan evidence

Create a chronology and list potential documents, system records and witnesses. Preserve original records and record how evidence was obtained. Collect only relevant material; unrestricted searches through personal communications create privacy and fairness problems.

Interview fairly

Explain the purpose, process, confidentiality limits and note-taking. Ask open questions, then test dates, details and inconsistencies. Give the person responding to an allegation enough information and opportunity to answer it. Do not treat nervousness, emotion or imperfect memory as proof.

Analyse each allegation separately

Compare accounts with contemporaneous records, plausibility, consistency and the witness’s opportunity to know. Distinguish fact, disputed fact and inference. Apply the standard required by the relevant process and explain the reasoning; avoid importing a criminal-law standard without basis.

Report and decide

The report should show scope, process, evidence, findings and limitations. The decision-maker considers the findings and the appropriate next process. Keep investigation and disciplinary decisions distinct unless the approved procedure combines them lawfully.

Close and retain

Communicate outcomes within privacy limits, provide any review route, implement safeguards and monitor retaliation. Store records with restricted access under the applicable retention approach.

This is general information, not legal advice. Obtain specialist guidance for statutory complaints or high-risk allegations.

Build a chronology without assuming it proves the case

A timeline can expose gaps and contradictions, but timing alone rarely explains motive. Record the source for each entry and distinguish a system timestamp from a person’s recollection. Allow witnesses to correct factual errors in interview notes.

Deal with unavailable or conflicting evidence

Not every event leaves a document and witnesses may disagree. The report should explain what was sought, what was unavailable and how limitations affected a finding. Absence of a message does not prove an event did not occur; an allegation alone does not prove that it did.

Plan communications before the report

Decide who receives the full report, finding summary or only an operational instruction. Witnesses usually need closure about participation, not the outcome of another employee’s case. Broad circulation increases privacy risk and can undermine later action.

Investigators should be trained to recognise conflicts of interest. Prior involvement in the underlying decision, close reporting relationships or a stated view of the parties may require another investigator or documented safeguards.