Calling an action an error describes a mismatch between what happened and what was expected. On its own, it does not explain the conditions that produced the action or identify the change most likely to prevent a repeat.
Reconstruct the situation
Separate what was known at the time from what became obvious afterwards. Establish the sequence, the information available, competing tasks and the state of equipment. Do not fill gaps in the evidence with assumptions about motivation.
HSE's investigation guidance organises the work around gathering information, analysing it, identifying controls and implementing an action plan. [1]
Examine the work conditions
Was the instruction compatible with the task? Could the relevant information be seen and interpreted? Was an abnormal condition being managed with a procedure intended for normal production?
HSE's human factors material includes job design, procedures, fatigue and organisational issues. [2] These topics provide lines of enquiry, not a predetermined explanation for every event.
Test the proposed corrective action
Ask how an action would have changed the specific circumstances. Another briefing may address a genuine knowledge gap. It is less convincing as the sole response to an inaccessible control or contradictory instruction.
Use a hypothetical repeat scenario to test the recommendation. Who would notice the developing problem, what would they do, and what in the system would support that response?
Share learning without exposing people
A community field note should describe the mechanism and the lesson without naming a worker, client or confidential site. Clearly distinguish confirmed findings from your interpretation.
Do not use a forum post to investigate an active emergency or make allegations about identifiable people. Those situations need appropriate reporting, investigation and legal processes.
Sources & context
- HSE: Investigating accidents and incidents (HSG245) Health and Safety Executive · Great Britain
- HSE: Human factors and ergonomics Health and Safety Executive · Great Britain
Source-linked editorial material, prepared 2026-09-05; updated 2026-09-05. Prepared with AI assistance. Not independently peer-reviewed. Sources and legal requirements can change. The linked organisations do not endorse this publication. Our editorial approach.
What would you add?
Which investigation question has helped you move beyond a simple error label?
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