Here are some of the most common questions that HR professionals in Ireland have around conducting workplace investigations – including the skills required to conduct an investigation, evidence gathering, witness testimonies and the most common mistakes we see internal teams make during investigations.
What are Terms of Reference in a workplace investigation?
Terms of Reference are the written framework that defines the scope and boundaries of a workplace investigation. In Ireland, they are a critical part of ensuring fair procedures and protecting the integrity of the investigation process.
The Terms of Reference typically outline:
- The allegations or complaints being investigated
- The timeframe under review
- The investigator’s role and authority
- The policies, procedures, or legislation involved
- The investigation process
- The required outcome, usually findings of fact
Clear Terms of Reference help ensure the investigation remains focused, proportionate, and procedurally fair.
Why are Terms of Reference important?
Terms of Reference are important because they provide clarity, structure, and fairness for everyone involved in the investigation.
Without properly drafted Terms of Reference:
- Investigations can drift beyond scope
- Irrelevant issues may be examined
- Employees may challenge the fairness of the process
- Employers may increase legal and reputational risk
In Ireland, workplace investigations are frequently scrutinised in proceedings before the Workplace Relations Commission (WRC) and the Labour Court. Clear Terms of Reference help demonstrate that the employer followed a structured and fair process.
They also ensure that employees understand:
- What is being investigated
- What is not being investigated
- How findings will be assessed
What skills does a workplace investigator need?
A workplace investigator requires a highly specialised skill set. Effective investigators need:
- Critical reasoning skills
- Knowledge of Irish employment law and fair procedures
- Analytical thinking
- Objectivity and impartiality
- Interviewing and conflict management skills
- Evidence assessment capabilities
- Strong attention to detail
- Excellent report writing skills
One of the most important skills is report writing. The final report may later be relied upon in WRC proceedings, internal appeals, or litigation.
A good investigator must be capable of analysing conflicting evidence, identifying inconsistencies, assessing credibility, and making evidence-based findings without bias.
Does everyone have the skills to be a workplace investigator?
No. Not everyone has the skills required to conduct a fair and effective workplace investigation.
Workplace investigations are often underestimated. Many people assume investigations are simply about interviewing employees and producing a report. In reality, investigations require specialist expertise and judgement.
A skilled investigator must be able to:
- Assess credibility objectively
- Apply fair procedures
- Analyse complex evidence
- Manage conflicting witness accounts
- Handle emotionally charged situations
- Produce balanced and legally robust reports
Strong report writing skills are particularly important because poorly drafted findings can undermine an otherwise fair process.
Experience in management, interviewing, or recruitment alone does not automatically make someone a competent investigator.
Does an HR Manager make a good investigator?
Not necessarily. While some HR Managers can become excellent investigators, HR experience alone does not automatically qualify someone to conduct workplace investigations.
Many HR practitioners overestimate their investigation capability because they have experience in recruitment, employee relations, or interviewing. However, workplace investigations require a very different skill set.
An investigator must be able to:
- Test evidence objectively
- Assess credibility
- Apply principles of fair procedures and natural justice
- Analyse inconsistencies
- Produce defensible findings
- Remain impartial under pressure
Recruitment interviewing and workplace investigations are fundamentally different processes. An investigator is not trying to identify the best candidate — they are attempting to establish facts fairly and objectively.
In Ireland, poorly conducted investigations can create significant legal exposure for employers, particularly where disciplinary action follows.
How do you gather evidence in a workplace investigation?
Evidence gathering involves collecting all relevant information relating to the complaint or allegation.
This may include:
- Witness interviews
- Emails and correspondence
- CCTV footage
- Policies and procedures
- Attendance records
- Digital communications
- Notes and records
- Financial documentation
The investigator must gather evidence fairly and objectively, including evidence that may support or contradict the complaint.
Good investigations focus on relevant evidence rather than gathering excessive amounts of information that distract from the core issues.
Maintaining confidentiality and preserving evidence integrity are also essential throughout the investigation process.
How do you substantiate witness testimony?
Witness testimony is substantiated by assessing its credibility, reliability, consistency, and supporting evidence.
An investigator may examine:
- Consistency of accounts
- Corroborating evidence
- Contemporaneous documentation
- Plausibility of events
- Potential motive or bias
- Behavioural consistency
- Supporting witness accounts
In many Irish workplace investigations, there may be conflicting versions of events with limited documentary evidence. In those cases, the investigator must carefully assess the reliability and credibility of the available evidence.
Investigators should avoid making findings based on assumptions, impressions, or unsupported allegations.
What is the balance of probabilities?
The balance of probabilities is the standard of proof used in most workplace investigations in Ireland.
It means that, based on the available evidence, something is more likely than not to have occurred.
This differs from the criminal standard of proof, which requires proof beyond reasonable doubt.
When applying the balance of probabilities, the investigator assesses:
- The quality and reliability of evidence
- Witness credibility
- Consistency of accounts
- Supporting documentation
A finding does not require absolute certainty. Instead, the investigator must determine whether one version of events is more probable than another based on the evidence available.
What types of workplace investigations should be outsourced?
Complex, high-risk, or sensitive investigations are often best outsourced to an independent external investigator.
Examples include:
- Protected disclosures or whistleblowing complaints
- Sexual harassment allegations
- Bullying and harassment complaints
- Fraud or theft investigations
- Complaints involving senior executives
- Multi-party or highly conflicted complaints
- Cases involving significant legal or reputational risk
External investigators can provide:
- Greater impartiality
- Specialist expertise
- Increased credibility
- Reduced conflicts of interest
- Greater confidence in the fairness of the process
In Ireland, employers frequently outsource sensitive investigations where independence and procedural fairness are particularly important.
What is a malicious or vexatious complaint?
A malicious or vexatious complaint is a complaint made dishonestly, in bad faith, or with the intention of causing harm.
However, proving that a complaint is malicious can be extremely difficult.
Importantly:
- A complaint that is not upheld is not automatically malicious
- Employees may genuinely believe their concerns are valid
- Insufficient evidence does not establish bad faith
To conclude that a complaint was malicious, there would usually need to be substantial evidence showing:
- Deliberate dishonesty
- Fabrication of allegations
- Intentional misleading behaviour
- Evidence of ulterior motive
Employers should exercise caution before labelling complaints as vexatious, as doing so without sufficient evidence may create additional legal and employee relations risks.
Why is the investigation report the most important element?
The investigation report is often the most important part of the investigation process because it provides the official record of:
- What was investigated
- How evidence was assessed
- How findings were reached
- Whether fair procedures were followed
The report creates an essential paper trail that may later be relied upon in:
- Workplace Relations Commission proceedings
- Labour Court hearings
- Internal appeals
- Litigation
- Regulatory investigations
Even where an investigation process was handled appropriately, a poorly drafted report can undermine the credibility of the entire process.
Strong report writing is therefore one of the most important skills an investigator can possess.
What are the most common mistakes in workplace investigations?
Some of the most common mistakes in Irish workplace investigations include:
- Poorly drafted Terms of Reference
- Lack of investigator impartiality
- Inadequate evidence gathering
- Failing to properly assess witness credibility
- Delays in the investigation process
- Procedural unfairness
- Making assumptions without evidence
- Weak or unclear report writing
- Expanding beyond the original complaint scope
- Using inexperienced investigators for complex matters
Another common mistake is assuming that HR or management experience automatically translates into investigative competence.
Poorly conducted investigations can expose employers to:
- WRC claims
- Reputational damage
- Employee distrust
- Procedural challenges
- Legal risk
Employers should ensure that investigators are appropriately trained and experienced for the complexity and sensitivity of the matter being investigated.
How long does a workplace investigation take?
There is no fixed timeframe for a workplace investigation in Ireland. The duration will depend on the complexity of the issues, the number of witnesses involved, the availability of evidence, and the level of cooperation from participants.
While employers should aim to conduct investigations promptly, delays are often unavoidable and can arise for legitimate reasons, including:
- Annual leave or holiday periods
- Witnesses being unavailable or reluctant to participate
- Employees refusing to engage
- Disputes regarding witness statements or interview notes
- Delays caused by third-party involvement such as trade union representatives or solicitors
- Sick leave or medical absences
- Delays in submitting relevant documentation or evidence
- Objections to the appointment of the investigator
- Challenges or objections regarding the investigation process itself
- The complexity or seriousness of the allegations
In some cases, investigations may also need to pause temporarily to allow procedural issues to be addressed fairly.
Employers should avoid rushing investigations simply to meet arbitrary deadlines. A poorly conducted or procedurally unfair investigation can create significantly greater legal and reputational risk than a delayed investigation.
However, employers should still ensure that:
- Delays are reasonable and justifiable
- Parties are kept informed of progress
- The investigation proceeds as efficiently as possible
- Unnecessary delays are avoided
In Ireland, excessive and unexplained delays can sometimes undermine confidence in the fairness of the process, particularly where they create prejudice for the employees involved.
What should I do if a workplace investigation runs over the timeframe outlined in the Terms of Reference?
In Ireland, investigation timeframes are important, but they are not absolute. What matters most is whether the employer can demonstrate that the investigation was progressed as efficiently and fairly as possible.
If an investigation exceeds the anticipated timeframe outlined in the Terms of Reference, employers should be able to justify the reasons for the delay and show that:
- The delays were reasonable and unavoidable
- The investigation continued to progress
- The parties were kept informed
- Fair procedures were maintained throughout
Delays can arise for many legitimate reasons, including:
- Witness unavailability
- Annual leave or sick leave
- Delays caused by trade union representatives or solicitors
- Disputes regarding witness statements
- Difficulties obtaining documentation or evidence
- Objections raised during the investigation process
What is far more problematic is where delays are caused by the investigator themselves, particularly where:
- The investigator lacks capacity
- The investigation is repeatedly deprioritised
- There are unexplained periods of inactivity
- The investigator is handling matters beyond their expertise
This is why organisations must carefully assess whether they have the internal capacity and expertise to conduct investigations appropriately.
In some cases, outsourcing the investigation may be necessary to ensure the matter is handled efficiently, independently, and professionally.
What should I do if an employee objects to me as the investigator?
If an employee objects to the appointment of an investigator, the objection should be considered carefully and objectively.
An objection does not automatically mean the investigator must step aside. However, employers should assess whether the objection raises a legitimate concern regarding impartiality, independence, or perceived bias.
Questions to consider include:
- Am I sufficiently independent from the issues or individuals involved?
- Is there any actual or perceived conflict of interest?
- Is the objection based on a genuine concern or simply dissatisfaction with the process?
- Would an external investigator be more appropriate?
- Could the objection undermine confidence in the fairness of the investigation?
In Ireland, the perception of fairness can be just as important as fairness itself. Even where an investigator believes they can remain objective, employers should consider whether a reasonable person could perceive bias or lack of independence.
This is particularly important in investigations involving:
- Senior employees
- Sensitive allegations
- Prior working relationships
- Grievances involving management
- Highly conflicted workplaces
In some situations, it may be more appropriate to outsource the investigation to avoid procedural challenges and protect the integrity of the process.
Employers should avoid dismissing objections without proper consideration, particularly where the objection raises credible concerns about impartiality or procedural fairness.
Why should you outsource a workplace investigation to Insight HR?
Workplace investigations are high-risk processes that require specialist expertise, independence, and procedural fairness. Poorly managed investigations can expose organisations to significant legal, reputational, and employee relations risks.
At Insight HR, workplace investigations are conducted by experienced investigators with extensive knowledge of Irish employment law, fair procedures, and workplace relations.
Organisations often outsource investigations to ensure:
- Independence and impartiality
- Procedural fairness
- Specialist investigative expertise
- Reduced internal conflict
- Greater credibility of findings
- A professionally managed process
- Legally robust investigation reports
Outsourcing can be particularly important where:
- Senior employees are involved
- Allegations are highly sensitive
- There are concerns about bias or conflicts of interest
- Internal HR teams lack capacity or specialist expertise
- The matter involves multiple complainants or witnesses
- The organisation wants to protect trust and confidence in the process
Insight HR’s barrister-led investigations team combines legal knowledge with practical workplace relations expertise. This ensures investigations are conducted fairly, proportionately, and in accordance with Irish employment law and best practice standards.
At Insight HR, investigations are approached with professionalism, objectivity, and sensitivity. The focus is not simply on completing a process, but on ensuring the investigation is fair, thorough, proportionate, and defensible.
The quality of the investigation process – and particularly the final report – can significantly impact the outcome of disputes before the Workplace Relations Commission, the Labour Court, or the civil courts. This is why experienced investigators and strong report-writing capability matter.
By outsourcing to Insight HR, employers can have confidence that investigations are handled independently, efficiently, and in line with best practice in Ireland.
What types of workplace investigations does Insight HR conduct?
Insight HR conducts a wide range of independent workplace investigations across both the public and private sectors in Ireland.
Investigations are tailored to the specific circumstances of each organisation and carried out in line with Irish employment law, fair procedures, and best practice.
Types of investigations commonly conducted include:
- Bullying and harassment investigations
- Sexual harassment investigations
- Protected disclosure and whistleblowing investigations
- Disciplinary investigations
- Grievance investigations
- Fraud and theft investigations
- Code of conduct investigations
- Complaints involving senior executives or leadership teams
- Workplace conflict and interpersonal complaints
- Retaliation or victimisation complaints
- Breach of policy investigations
- Misconduct and gross misconduct investigations
Insight HR is often engaged where:
- The issues are complex or high-risk
- Internal impartiality may be questioned
- There are concerns regarding conflicts of interest
- An external independent investigator is required
- Internal HR teams lack capacity or specialist expertise
- The organisation wants to protect the integrity and credibility of the process
Every investigation is conducted with a focus on:
- Procedural fairness
- Independence and objectivity
- Thorough evidence assessment
- Timely case management
- Clear and defensible reporting
The approach taken is practical, balanced, and aligned with the realities of Irish workplace relations and employment law.
Does Insight HR provide workplace investigation training for HR teams and managers?
Yes. Insight HR provides workplace investigation training for HR professionals, managers, supervisors, and leadership teams across Ireland.
The training is designed to help organisations manage workplace investigations fairly, confidently, and in line with Irish employment law and best practice.
Many HR professionals and managers are expected to conduct investigations without ever receiving formal investigation training. However, workplace investigations are highly specialised processes involving procedural fairness, evidence assessment, credibility analysis, and legally robust report writing.
Insight HR provides practical, experience-led training covering areas such as:
- Conducting workplace investigations
- Bullying and harassment investigations
- Sexual harassment investigations
- Investigation planning and Terms of Reference
- Witness interviewing techniques
- Assessing credibility and evidence
- Managing difficult participants
- Fair procedures and natural justice
- Report writing and findings
- Disciplinary and grievance processes
- Employment law obligations in Ireland
Training can be delivered:
- In-person
- Online
- Through the Insight HR Online Training Hub
- As tailored programmes customised to the organisation’s needs
Importantly, the training is grounded in real-world investigative experience rather than purely theoretical learning.
Investigation training can help organisations:
- Reduce legal and procedural risk
- Improve management capability
- Avoid common investigation mistakes
- Strengthen report writing and documentation
- Build confidence in handling complaints appropriately
- Identify when external investigators may be required
Many organisations also use investigation training proactively as part of a broader strategy to strengthen workplace culture, governance, and compliance standards.
Get in touch if you’d like to learn more about our Workplace Investigations services.
