Walk into any organisation in Malaysia and ask to see the last five incident investigation reports. In at least four of them, somewhere in the root cause section, you will find the words “human error.”
It is the most common finding in workplace investigations. It is also one of the least useful.
This article explains why human error in incident investigation is a description of what happened, not an explanation of why — and what a rigorous investigation finds instead.
What “Human Error” Actually Means
When a report cites human error, it is saying one of three things: a worker made a decision that deviated from procedure; a worker performed an action incorrectly; or a worker failed to take a required action. All three describe what the person did. None answer the question an investigation should ask: what management condition placed this person in a situation where that error was likely?
In Tripod Beta, human error maps to the Substandard Act — the action that caused the barrier to fail. It is not an underlying cause. It is one of the last links in the causation chain before the event.
The Tripod Beta Causation Chain: Where Human Error Sits
Tripod Beta builds causation around: Underlying Cause → Precondition → Substandard Act or Condition → Failed Barrier → Event. Human error is the Substandard Act. The investigation traces backwards to find the Precondition (the measurable state that made the error likely) and the Underlying Cause (the management system failure that produced that state).
A Practical Example: The Same Incident, Two Investigations
A technician operates a valve in the wrong sequence during plant startup. A pressure surge causes pipe damage. One worker is injured.
Investigation A: Stops at Human Error
Cause: Human error — operator inattention.
Corrective action: Retrain operator. Remind all technicians of correct sequence.
The file closes. The same risk continues for every other technician.
Investigation B: Applies Tripod Beta
Substandard Act: Technician operated valve out of sequence.
Precondition: Technician had not been assessed on the updated procedure issued four weeks prior.
Underlying Cause: No system exists to communicate procedural changes to affected personnel and verify understanding before the change takes effect.
Corrective Action: Implement a management of change procedure requiring competency verification before affected personnel resume the task.
The second investigation changes the management condition. Every technician at that plant is now safer — not just the one retrained.
Why Malaysian Investigations Stop at Human Error
Time pressure. DOSH notification timelines create pressure to close investigations quickly. Human error is the path of least resistance.
Investigator training. Most sites use 5 Whys or basic fishbone — neither is designed to trace causation to the management system level.
Organisational culture. In organisations where blame is the default response, finding a management system failure implicates managers. Finding human error implicates the worker. One of these is safer for the investigator.
The Question Every Investigation Should Ask
Whenever your report contains “human error,” apply this test: what management condition placed this person in a situation where this error was likely? If you can answer it, human error was the symptom. If you cannot, the investigation is not complete.
Under OSHA 2022, DOSH’s scrutiny of investigation quality has increased. An investigation register full of human error findings followed by retraining corrective actions is not evidence of a functioning safety management system.
Learn to Investigate Beyond Human Error
Cikgu Barrier’s Tripod Beta training is Malaysia’s only accredited option, delivered by a Tripod Trainer certified by the Stichting Tripod Foundation and the Energy Institute UK.