Once an employer decides a complaint needs investigation, the next question is often whether the investigation should be handled internally or externally.
There is no universal answer.
An internal workplace investigation can be efficient, informed and entirely fair. An external workplace investigation can provide independence, specialist experience and distance from internal relationships.
The better choice depends on the matter itself, not on a belief that one model is always more professional than the other.
When an internal workplace investigation works well
Internal investigation can be a very good option where the organisation has somebody with the right skills and enough independence from the issue.
An internal investigator already understands the business, the roles people perform and the systems or documents being discussed. They may be easier for witnesses to access and can often move quickly.
Internal investigation also avoids bringing an unfamiliar person into a matter that may be relatively contained.
If the allegations are straightforward, the investigator has no meaningful conflict and the people involved are likely to accept their neutrality, there may be no reason to outsource the work.
The limits of internal investigation
Problems arise when the internal investigator is being asked to wear too many hats.
The People and Culture manager may already have advised the complainant’s manager, supported the respondent on an earlier issue, attended a relevant meeting or briefed executives about the complaint.
They may also need to manage the workplace while trying to act as the neutral fact finder.
That does not automatically make the investigation unfair. It does make it worth asking whether the roles can genuinely be separated and whether the parties will have confidence in the result.
When an external workplace investigation adds value
An external investigator is often useful where independence itself is important.
That may include complaints about senior leaders, allegations involving the People and Culture function, whistleblower matters, highly sensitive conduct, long running conflicts or situations where an earlier internal process has already become contentious.
External investigators can also help when the evidence is complex and the internal team simply does not have the time or investigation experience to manage it well.
Think about capability, not only independence
A person can be independent and still not be the right investigator.
Workplace investigations require more than interviewing a few people and summarising what they said.
The investigator needs to frame allegations clearly, understand procedural fairness, gather relevant evidence, identify inconsistencies, assess competing accounts and explain how the findings were reached.
Whether you choose an internal or external workplace investigation, the person conducting it needs to be capable of doing those things.
Think about time and practical workload
Internal teams are often managing the complaint at the same time as everything else.
They are supporting employees, advising managers, dealing with leave, performance issues, recruitment and the ordinary work of the business.
A complex investigation can require hours of interview preparation, evidence review and report writing.
If the investigation will continually be pushed behind other work, using an external investigator may be more practical even where there is no conflict.
Think about how the process will be perceived
Fairness is not determined by perception alone, but perception still matters.
If the complainant believes the internal investigator is close to the respondent, or the respondent believes the investigator has already advised the complainant, the process may begin with a credibility problem that could have been avoided.
Sometimes an independent investigator gives both parties a cleaner starting point.
That does not mean everybody will agree with the findings. It means the argument can focus on the evidence rather than who conducted the investigation.
A hybrid approach can work too
The choice is not always fully internal or fully external.
An organisation might keep the investigation internal but obtain independent advice on scope, allegations, interview planning, procedural fairness or the draft report.
Another option is external investigation oversight, where an experienced investigator reviews key stages while the internal investigator retains responsibility for the matter.
That can be a sensible option for organisations building their own investigation capability.
Choose the process that fits the matter
If you are comparing an internal or external workplace investigation, consider five things: independence, capability, complexity, capacity and confidence in the process.
If the internal option is strong across those areas, keep it internal. If there are gaps that could affect the integrity or usefulness of the investigation, external support may be worthwhile.
I provide independent workplace investigations as well as investigation advisory and oversight. That means I can help with the decision before you commit to outsourcing the whole matter.