How to Conduct a Workplace Investigation Interview (New Zealand Guide)

The Purpose of a Workplace Investigation Interview

Workplace investigation interviews are conducted to gather information from individuals involved in, or relevant to, a workplace concern. The aim is to obtain clear, factual accounts and ensure that all relevant perspectives are considered.

This may include:

• the person who made the complaint
• the employee who is the subject of the allegations
• witnesses or other relevant parties

Each interview forms part of the broader workplace investigation process, helping to build an accurate understanding of the events in question.

Interviewing the Respondent

Interviewing the employee who is the subject of the allegations is a critical part of ensuring procedural fairness in a workplace investigation. Employers must ensure that the respondent clearly understands the allegations and has a genuine opportunity to respond.

During this interview, employers should:

• clearly outline the allegations
• provide sufficient detail for the employee to respond
• allow the employee to present their account fully

Care must be taken to avoid forming conclusions before all evidence has been gathered. A fair and well-conducted interview ensures that the investigation process remains balanced and that findings are based on a proper assessment of all available information.

Interviewing Witnesses

Witness interviews play an important role in corroborating information and providing additional context.

When interviewing witnesses, investigators should:

• focus on factual observations rather than opinions
• avoid sharing unnecessary information about the allegations
• assess the consistency and reliability of evidence

Each witness interview contributes to the overall understanding of the matter and helps support a thorough and objective investigation.

Legal Considerations in New Zealand

Employers must ensure that workplace investigation interviews are conducted in accordance with New Zealand employment law principles. This includes acting in good faith, ensuring procedural fairness and avoiding bias.

Employees must be informed of the allegations against them and given a reasonable opportunity to respond before any decisions are made. Failing to follow a fair process can expose organisations to legal risk.

Guidance on fair workplace processes can be found through Employment New Zealand.

Common Mistakes to Avoid

Workplace investigation interviews can be undermined by poor process or inconsistent approaches. Avoiding common mistakes helps ensure that the investigation remains fair and that findings are reliable.

Common issues include:

• asking leading or biased questions
• failing to properly document responses
• not giving individuals a fair opportunity to respond
• rushing the interview process
• forming conclusions before all evidence is gathered

Even relatively small procedural errors can impact the integrity of an investigation. A careful and structured approach helps ensure that the process is defensible.

Using an Independent Workplace Investigator

In complex or sensitive matters, organisations may benefit from engaging an independent professional to conduct workplace investigations.

This may be appropriate where:

• allegations involve serious misconduct
• senior staff are involved
• the matter is sensitive or high-risk
• impartiality is critical

Independent investigators can provide an objective assessment of the evidence and ensure that interviews are conducted in accordance with best practice.

Workplace Investigation Interviews Across New Zealand

Synergy Workplace Investigations supports organisations across New Zealand by conducting professional workplace investigation interviews and managing end-to-end investigation processes.

Our experienced investigators ensure that interviews are structured, fair and aligned with employment law obligations, helping organisations reach well-informed and defensible outcomes.