Beyond the Obvious: Getting to the Root Cause
When a workplace incident occurs, the first cause is often easy to identify: a worker slipped on a wet floor, a machine guard was bypassed, equipment failed, or a procedure wasn’t followed.
But identifying what happened is not the same as understanding why it happened.
If an investigation stops at the obvious cause, the corrective action often does too. The floor gets dried. The employee is reminded to follow the procedure. The broken part gets replaced.
The immediate problem is fixed—but the conditions that allowed it to happen may still be there.
That is where root cause analysis is essential to preventing recurrence.
Looking Beyond the First Answer
Root cause analysis is a structured way of looking beyond the immediate cause of an incident, near miss, or recurring problem to understand the underlying factors that contributed to it.
A simple way to put this into practice is to keep asking: “Why was this able to happen?”
Consider a worker who slips on a wet floor: The immediate cause is obvious. The floor was wet.
But an effective investigation shouldn’t stop there. We need to ask:
Why was the floor wet? Perhaps a piece of equipment was leaking.
Why was the leak still present? Perhaps it had been reported previously but the repair had been deferred.
Why was the hazard not controlled in the meantime? Perhaps there was no clear process for escalating maintenance issues or ensuring temporary controls were put in place.
Now the investigation has moved beyond “clean up the water” to identifying weaknesses in maintenance, communication, and hazard control.
Those are issues that should be corrected to help prevent the incident from happening again.
Don’t Stop at “Human Error”
The same approach is particularly important when an employee’s actions appear to have contributed to an incident.
Suppose a worker bypasses a machine guard and is injured. It may be tempting to conclude that the worker failed to follow the rules and recommend retraining or disciplinary action.
Instead, ask a few more questions:
Why was the guard bypassed?
Was the task difficult or impractical to perform with the guard in place?
Was the equipment frequently jamming?
Were employees under pressure to maintain production?
Had supervisors seen the shortcut used before?
Had other employees adopted the same practice?
The answers may reveal that what initially looked like an individual decision was actually a predictable response to a larger workplace problem.
Statements such as “the employee was careless” or “the worker failed to follow procedure” describe behaviour; they rarely explain its cause.
A useful test is this:
If your corrective action is simply “remind,” “retrain,” or “tell employees to be more careful,” ask whether you have gone deep enough.
Training may absolutely be part of the solution—but it should address an identified cause, not become the default response to every incident.
A Simple Approach You Can Use
Root cause analysis does not need to be complicated. One of the simplest approaches is to ask “Why?” four or five times, with each answer leading to the next question.
For example:
Why did the incident happen?
Identify the immediate cause. A worker slipped because the floor was wet.
Why was the floor wet?
A piece of equipment was leaking.
Why was the equipment still leaking?
The leak had been reported, but the repair had not been completed.
Why had the repair not been completed?
There was no clear process for prioritizing or escalating outstanding maintenance issues.
Why was there no process in place?
Responsibility for reviewing and following up on reported maintenance issues had never been clearly assigned.
By continuing to ask “Why?”, the investigation moves from “the floor was wet” to a much more useful finding: there is a gap in how maintenance issues are assigned, prioritized, and followed through.
The same approach can be used when the issue involves training, procedures, equipment, supervision, communication, or worker actions. If training was inadequate, ask why. If a procedure wasn’t followed, ask why. If equipment failed, ask why.
You may not always need exactly five questions. The point is to keep asking “Why?” until you identify something meaningful that can be changed to help prevent the incident from happening again.
From Correction to Prevention
Root cause analysis should not be reserved for serious injuries. Near misses, repeated equipment failures, recurring hazards, quality problems, and repeated non-compliance can all be early warning signs of a larger issue.
If the same problem keeps coming back—even after it has supposedly been “corrected”—that is a strong indication that the root cause has not been addressed.
The goal of incident investigation is not simply to determine who or what was involved. It is to learn enough from the event to reduce the likelihood of it happening again.
The next time an incident, near miss, or recurring safety concern arises, resist the urge to stop at the first explanation.
Find out what happened. Then ask why. And keep asking until the corrective actions address the conditions that made the incident possible in the first place.
Fixing the immediate hazard solves today’s problem. Addressing the root cause can prevent tomorrow’s incident.
