How to Manage Workplace Investigations

You never know when a conflict, complaint or serious issue may arise at work. People can be unpredictable, emotions can run high, and facts are rarely clear from day one. Knowing how to manage workplace investigations is an essential capability for leaders and HR because the way you respond can determine whether a matter is resolved fairly or escalates into legal risk, workers compensation claims, reputational damage or lasting cultural harm.

When an employee raises a serious complaint, employers have a duty to act. That includes taking reasonable steps to stop alleged wrongdoing and prevent further harm. A workplace investigation is a structured fact-finding process that gathers and tests evidence, so decisions are based on information, not assumptions.

This guide outlines a practical, defensible approach for managing workplace investigations consistently and fairly.

What is a workplace investigation?

A workplace investigation is a formal process used to determine what happened, based on evidence. It typically involves:

• clarifying the allegations and issues to be investigated

• interviewing relevant parties and witnesses

• collecting documents, records and other evidence

• assessing credibility and probabilities

• making findings and recommendations for next steps

A good investigation strengthens trust in leadership, demonstrates procedural fairness, and supports lawful and appropriate outcomes.

When should you investigate?

The obligation to investigate usually arises when the allegation, if substantiated, could involve:

• bullying, harassment or discrimination

• sexual harassment or other misconduct

• fraud, theft or serious policy breaches

• safety incidents or psychosocial hazards

• repeated interpersonal conflict with potential misconduct elements

• whistleblower reports or integrity concerns

Not every interpersonal issue requires a formal investigation. Some matters are better handled via informal resolution, coaching or mediation. But where allegations are serious, repeated, or create risk to people or the organisation, a structured investigation process is often necessary.

Principles for managing workplace investigations fairly

If you want to manage workplace investigations well, the process must be:

Prompt
Delays can increase harm, anxiety and risk.

Impartial
The investigator must be unbiased and be seen as unbiased.

Procedurally fair
Parties must be informed of allegations and given a genuine opportunity to respond.

Confidential (as far as possible)
Confidentiality should be maintained, but never promised as absolute. Information may need to be shared on a need to know basis to conduct a fair process.

Well documented
Accurate records are critical if decisions are challenged later.

Step by step: How to manage workplace investigations

1. Triage the complaint and assess immediate risk

As soon as a complaint is raised, record the core details and assess whether you need immediate risk controls, for example:

• separating the parties (temporary reporting line change, roster adjustment, remote work)

• directing no contact

• securing evidence (emails, access logs, CCTV retention)

• offering wellbeing support through EAP

Where there is a safety risk, act first, investigate next.

2. Decide whether a formal investigation is required

Before launching a full investigation, consider:

• the seriousness of the allegations

• whether there is a genuine dispute of facts

• whether informal resolution is appropriate and safe

• the potential consequences if substantiated

• any legal, policy, award or enterprise agreement obligations

Document your decision and rationale.

3. Select the appropriate investigator

Choosing the right investigator is critical. Options include:

• Internal investigator (appropriate for lower risk matters where expertise and independence can be maintained)

• External investigator (recommended where allegations are serious, senior leaders are involved, there are conflicts of interest, or there is high legal or reputational risk)

The investigator should have investigation capability, strong interviewing skills, and no prior involvement in the matter.

4. Define the scope and investigation plan

Set clear parameters before any interviews begin:

• allegations to be investigated (in writing)

• relevant policies and standards

• the timeframe being examined

• likely evidence sources (systems, documents, people)

• interview list and order

• confidentiality expectations

• indicative timeframes and reporting approach

A defined plan prevents scope creep and ensures consistency.

5. Notify the parties and explain their rights

Write to the complainant and respondent explaining:

• the allegation summary (with enough detail to respond)

• the investigation process and expected steps

• confidentiality expectations and limits

• the right to a support person in interviews

• victimisation protections and behavioural expectations

• EAP and wellbeing support options

Clear communication reduces stress and misunderstandings.

6. Consider whether suspension is required

In some matters it may be reasonable to suspend the respondent on full pay while the investigation proceeds. This should be considered carefully and used only where appropriate, such as where:

• there is a risk to safety or wellbeing

• there is a risk of interference with witnesses or evidence

• continued attendance may undermine the process or workplace stability

Suspension is not a finding. Document the rationale and keep it under review.

7. Conduct interviews professionally and consistently

A common best practice sequence is:

1. complainant interview

2. respondent interview

3. witness interviews

4. follow up interviews if required

Each interview should:

• be planned with clear questions linked to allegations

• allow the interviewee to provide their full account

• test facts, dates, context and corroboration

• record notes accurately (and confirm key points where possible)

Support persons should be allowed, but their role is to support, not answer questions.

8. Gather and secure evidence

Collect relevant evidence early, including:

• emails, messages and collaboration tools

• HR and performance records

• rosters, swipe card logs, system access logs

• CCTV or incident reports (where lawful and available)

• policies, procedures, training records

• prior complaints or related documentation (handled carefully)

Maintain chain of custody and limit access to evidence.

9. Make findings based on evidence and probability

Workplace investigations generally apply the civil standard of proof: what is more likely than not, based on available evidence.

Findings may be:

• substantiated

• not substantiated

• inconclusive (insufficient evidence)

• vexatious or malicious (rare, and requires evidence)

Avoid assumptions. Explain how evidence was weighed, especially where accounts conflict.

10. Produce an investigation report and close out the matter

A defensible investigation report usually includes:

• allegations and scope

• process followed

• evidence considered

• credibility assessment (where relevant)

• findings for each allegation

• recommendations for next steps (if in scope)

Then communicate outcomes appropriately:

• provide the complainant with an outcome summary (not full confidential details)

• provide the respondent with findings and any next steps

• remind all parties about confidentiality and expected behaviour moving forward

What happens after the investigation?

Your next steps depend on findings and may include:

• no further action

• mediation or facilitated workplace restoration

• training, coaching or leadership action

• performance management

• disciplinary action (including warnings or termination)

• policy updates, risk controls, or psychosocial hazard management actions

Also consider broader learnings: patterns, team risks, leadership gaps, workload issues, and whether WHS controls need strengthening.

Common mistakes to avoid

• promising absolute confidentiality

• investigating without a clear scope or plan

• delaying interviews and allowing evidence to disappear

• using an investigator with a conflict of interest

• failing to give the respondent enough detail to respond

• poor documentation and inconsistent records

• treating investigation as discipline, rather than fact finding

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