Should You Investigate or Mediate? Knowing When Each Is Right

The Most Important Decision Comes Before the Investigation Begins

One of the most consequential decisions an organisation makes when a workplace problem arises is not how to conduct the investigation. It is whether to investigate at all. Choosing the wrong process at the outset can make matters significantly worse: deepening conflict, entrenching positions, damaging relationships that could have been repaired, and exposing the organisation to risks that a more proportionate response would have avoided.

Not every workplace concern requires a formal investigation. Some disputes are rooted less in misconduct or wrongdoing and more in communication breakdown, interpersonal tension, personality clash, misunderstanding or damaged working relationships. In those cases, mediation or another structured resolution process may offer a more constructive outcome than a formal evidential enquiry.

But some matters are too serious, too sensitive or too high risk for informal handling. Allegations involving misconduct, discrimination, whistleblowing, safeguarding, abuse of power, dishonesty or senior conduct usually require a properly scoped investigation. In those situations, choosing mediation over investigation may expose the organisation to criticism, legal challenge, reputational damage and avoidable escalation.

This chapter is part of the Workplace and Corporate Investigations Knowledge Guide. If you need an independent investigator or a commercial mediator, see my independent workplace investigator page and my commercial mediator page.

The Pause: Why It Matters Even When the Answer Is to Investigate

Before any process is initiated, there is value in a deliberate pause to assess what the situation actually requires. This pause is not hesitation or avoidance. It is a risk management tool. It ensures the right process is chosen for the right reasons, rather than defaulting reflexively to formal investigation simply because a complaint has been raised.

The pause asks: what problem is the organisation actually trying to solve? Is the core issue whether something improper happened and needs to be established through evidence? Or is the core issue relational, involving a breakdown in communication or working relationships that both parties might be willing to address constructively? Those are different problems, and they call for different responses.

Even where the pause leads to the conclusion that a formal investigation is necessary, it remains valuable. It clarifies the scope of the investigation, identifies whether issues are interconnected, determines whether senior management conduct is itself under scrutiny, and informs the decision about whether an internal or external investigator is appropriate. A well-considered pause before investigation begins is a sign of good practice, not indecision.

Does This Really Warrant a Formal Investigation?

Some matters clearly require formal investigation. Allegations of serious misconduct, discrimination, sexual harassment, whistleblowing detriment, safeguarding concerns, dishonesty or conduct involving power imbalance almost always need a structured, evidential process that can withstand scrutiny.

Other matters may not. A personality clash between two colleagues who are both willing to engage constructively may be better addressed through facilitated conversation or mediation than through a process designed to establish blame. A communication breakdown that has created tension but not crossed the threshold of formal misconduct may respond better to structured discussion than to investigation. Performance concerns that have not crystallised into specific misconduct allegations may need a performance management process rather than an investigation.

The risk of over-investigation is real and often underestimated. Initiating a formal investigation into matters that did not require one can harden positions, damage relationships that could have been preserved, create a perception of blame before any finding has been made, and generate grievances and counter-grievances that significantly complicate resolution. Employees are sensitive to process. A formal investigation sends a serious signal, and that signal should be proportionate to the seriousness of the concern.

The Destructive Potential of Investigations

Workplace investigations, even well-conducted ones, are inherently stressful for everyone involved. Complainants may relive difficult experiences. Subjects may feel unfairly accused before any finding has been made. Witnesses may feel caught between competing loyalties. Teams may become divided and distracted. The process itself, regardless of outcome, can cause lasting damage to working relationships and organisational culture if it is not handled with care and proportionality.

This does not mean investigations should be avoided where they are necessary. It means they should be initiated deliberately and proportionately, with a clear understanding of the disruption they will cause and the organisational investment required to manage that disruption well. An investigation that was unnecessary, or that was disproportionate in its scope, creates harm without the justification of establishing facts that genuinely needed to be established.

When Mediation May Be the Better Course

Mediation may be the better option where the issue is primarily relational rather than evidential, where both parties remain in employment and the working relationship is worth preserving, where there is genuine willingness on both sides to engage constructively, and where the real problem is a breakdown in communication or mutual understanding rather than a specific allegation of misconduct that needs to be proved or disproved.

In the right circumstances, mediation can reduce hostility, restore communication and allow both parties to reach a workable understanding of how to move forward, without the entrenching effect of a formal process. It may be particularly valuable early in a dispute, before positions have hardened, relationships have broken down completely, or legal proceedings have been threatened.

Mediation is also confidential. What is said during mediation cannot generally be used in subsequent proceedings. This allows parties to speak more openly than they might in a formal process, and to explore solutions that might not be available in a more adversarial setting. For more on commercial mediation see my commercial mediator page and the commercial mediation knowledge hub.

The Difference Between Workplace Mediation and Employment Mediation

These two forms of mediation serve different purposes and it is important to understand the distinction.

Workplace mediation focuses on repairing relationships within the organisation. It is future-oriented, aiming to help people work together more effectively. The mediator facilitates conversations but does not recommend outcomes or make findings. The goal is understanding, clarity and agreement on how to move forward. This is most appropriate early in a dispute, before the employment relationship has broken down irrecoverably.

Employment mediation, by contrast, typically involves parties who are already in dispute, often after a grievance, a breakdown in trust or even the start of legal proceedings. These mediations are more likely to involve discussions about settlement, exit terms or financial compensation. The focus is less on repairing the working relationship and more on resolving the broader employment dispute.

Recommending the wrong type of mediation can undermine trust. If an employee comes expecting relationship repair but feels pushed toward settlement, they may believe the organisation wants to silence them. Conversely, using workplace mediation when the employment relationship is beyond repair may waste time and deepen frustration. The choice must reflect what the situation actually requires.

Without Prejudice Conversations

In some circumstances, a without prejudice conversation, sometimes called a protected conversation under section 111A of the Employment Rights Act 1996, may offer a route to resolution outside the formal investigation and grievance process. These conversations allow an employer and employee to discuss settlement terms, including exit arrangements, without those discussions being used as evidence in subsequent unfair dismissal proceedings.

However, without prejudice conversations have important limitations. They do not provide protection in discrimination or whistleblowing claims. They require genuine voluntariness from both parties. And they must be handled carefully to avoid later arguments about improper pressure. Legal advice should be obtained before initiating or participating in such a conversation.

When Formal Investigation Is the Right Course

A formal investigation is normally required where there are serious allegations that need to be tested against evidence, where disputed facts need to be established before any decision can be made, where the matter may lead to disciplinary, grievance, safeguarding or governance outcomes, or where the organisation may later need to explain what was done and why.

This includes situations involving allegations of misconduct, discrimination, harassment, whistleblowing detriment, abuse of authority, safeguarding concerns, dishonesty, financial irregularity or conduct that may require regulatory notification. It also includes situations where power imbalances, concerns about retaliation, multiple allegations or overlapping issues mean the organisation needs more than resolution. It needs clarity, accountability and a reliable evidential record.

Where formal investigation is required, the choice of investigator, the scope of the investigation and the terms of reference all matter significantly. For detailed guidance on these decisions see the chapters on choosing the right investigator and planning and managing the investigation.

Managing Expectations When Investigation Proceeds

Where investigation is the right course, the organisation’s role in managing the expectations of all involved is critically important. Investigations take time. They involve uncertainty. They can be stressful for all parties even when handled well. HR’s role is not to promise a particular outcome or a rapid resolution, but to promise fairness: a process that takes the concerns seriously, examines the evidence carefully, and reaches conclusions that can be clearly explained.

Clear communication at the outset about the process, the timescales, what will and will not be shared during the investigation, and what support is available to all parties reduces anxiety and encourages more open engagement with the process. It also reduces the risk of side conversations and informal escalation that can complicate an investigation that is still under way.

Published Resources

My book The Workplace and Corporate Investigator’s Handbook covers this chapter in full, including the investigation pathway decision matrix, a real case study of a senior workplace mediation between two directors, and detailed guidance on managing the transition from informal to formal process when it becomes necessary.

See all books.

Frequently Asked Questions

Can mediation be used alongside a formal investigation?

In some cases yes, but the sequencing matters. Where serious allegations require formal findings to be made, mediation should generally follow rather than precede or replace the investigation. Using mediation before establishing the facts can be interpreted as an attempt to manage the situation without proper scrutiny, and can expose the organisation to criticism if the matter is later escalated.

What if an employee refuses to engage with mediation?

Mediation is voluntary. An employee cannot be compelled to participate. Where an employee declines mediation and the matter cannot be resolved informally, the organisation will need to consider whether a formal investigation or other process is appropriate. The refusal to mediate should be recorded and the reasons understood, as this may inform the choice of next steps.

How do I know whether a situation has crossed the threshold for formal investigation?

Key indicators that formal investigation is likely to be required include: the allegations involve potential misconduct, discrimination, harassment, whistleblowing, safeguarding or dishonesty; the facts are disputed and need to be established on evidence; the matter may lead to disciplinary action or regulatory notification; or the organisation needs to be able to demonstrate what it did and why if the matter is later challenged. Where you are uncertain, early external advice can help clarify the appropriate response.

Is workplace mediation the same as employment mediation?

No. Workplace mediation focuses on repairing working relationships and is future-oriented. Employment mediation typically addresses disputes that have already escalated and may involve settlement or exit discussions. The right type of mediation depends on what the situation actually requires. Using the wrong type can worsen rather than resolve the situation.

Can you help with both investigation and mediation?

Yes, though not in the same matter. I act as an independent workplace investigator in matters requiring formal investigation and as a commercial mediator in matters suitable for mediation. I do not act in both capacities in the same dispute.

Get in Touch

If you need an independent investigator, a commercial mediator, an independent hearing chair, or training for your HR team, I would be glad to discuss your requirements.

Call 020 4538 0246, use the contact form below, or book a call directly.

Important disclaimer: This page is provided for general information and educational purposes only and does not constitute legal advice. The content may not be legally accurate for your specific situation. You must not rely on anything on this page in respect of your legal rights or obligations. Always seek independent legal advice before taking or refraining from taking any action. The author accepts no responsibility for any decisions made or outcomes arising from use of this material. If you would like specific advice, contact me here.

Knowing when to investigate and when mediation may be better