At some point, most organisations will need to investigate a workplace concern.

This may arise from a grievance raised by an employee, an allegation of misconduct, or concerns about behaviour within a team. When handled appropriately, workplace investigations allow organisations to establish the facts of a situation and make fair, proportionate decisions.

However, investigations can become challenging if the process is unclear or poorly structured. Taking a methodical and balanced approach helps ensure the investigation remains fair, focused and defensible.

When Is a Workplace Investigation Necessary?

A workplace investigation is typically required when an organisation needs to establish the facts surrounding a concern before deciding what action, if any, should be taken.

Common situations that may require an investigation include:

• formal grievances raised by employees
• allegations of misconduct or inappropriate behaviour
• complaints of bullying or harassment
• concerns about breaches of workplace policies
• serious performance concerns linked to conduct

An investigation allows organisations to examine the available information before making decisions that may affect employees.

Step 1: Clarify the Allegations

The first step in any investigation is clearly identifying what concerns are being examined.

This means defining:

• the specific allegations
• the relevant time period
• the policies or standards that may apply

Without clear allegations, investigations can become unfocused and difficult to manage.

Defining the issue early helps ensure that the process remains proportionate and fair.

Step 2: Establish the Scope of the Investigation

Once the concerns are identified, the next step is determining the scope of the investigation.

This may include deciding:

• what issues will be examined
• what issues fall outside the investigation
• who should conduct the investigation
• what timeframe the investigation should cover

Establishing clear parameters helps prevent the investigation from expanding unnecessarily as new issues arise.

Step 3: Gather Relevant Evidence

Workplace investigations typically involve reviewing relevant information such as:

• written statements
• emails or internal communications
• organisational policies
• other documentation relevant to the concern

The purpose of this stage is to gather information that helps clarify what happened.

Investigations should remain focused on evidence that is directly relevant to the issue being examined.

Step 4: Conduct Interviews

In many investigations, interviews are conducted with individuals who may have relevant information.

This may include:

• the individual who raised the concern
• the employee whose behaviour is being examined
• relevant witnesses

Interviews should be conducted in a neutral and structured manner to ensure that individuals have an opportunity to explain their perspective.

Maintaining a calm and respectful tone during interviews helps support fairness and transparency throughout the process.

Step 5: Review the Evidence

After evidence has been gathered and interviews conducted, the investigator reviews the information to determine what findings can reasonably be made.

Workplace investigations generally operate on the balance of probabilities, meaning decisions are based on what is more likely than not to have occurred based on the available evidence.

The investigator’s role is to establish factual findings rather than determine disciplinary outcomes.

Step 6: Produce an Investigation Report

At the conclusion of the investigation, the findings are usually summarised in a written report.

This report typically outlines:

• the allegations examined
• the evidence considered
• the factual findings of the investigation

The report helps decision-makers understand the outcome of the investigation and determine whether further action is necessary.

Maintaining Fairness Throughout the Process

Fairness is a central principle in workplace investigations.

A well-structured investigation helps ensure that:

• concerns are addressed objectively
• individuals understand the issues being examined
• decisions are based on evidence rather than assumption

Following recognised procedural guidance, such as ACAS principles, can help organisations maintain confidence in the process.

The Value of Structured Guidance

Workplace investigations can involve complex interpersonal dynamics as well as procedural considerations.

Organisations sometimes seek independent guidance to help structure investigations appropriately, particularly where concerns are sensitive or involve multiple parties.

Independent advisory support can help organisations clarify scope, manage risk and maintain procedural fairness throughout the process.

Conclusion

Workplace investigations are an important part of managing employee relations concerns.

By approaching investigations in a structured and proportionate way, organisations can establish facts fairly and make informed decisions while maintaining confidence in the process.

Clear procedures, careful evidence gathering and balanced decision-making all contribute to effective workplace investigation management.

If You Need Independent Guidance

ADR Hub provides independent employee relations advisory and workplace mediation services to support organisations managing workplace investigations, grievances and disciplinary matters.

If you would like to discuss a workplace issue confidentially, please feel free to get in touch.