RESEARCH_FILE
James Reason
University of Manchester
Known for:The Swiss cheese model of accident causation — the foundational framework showing that complex system failures require multiple simultaneous holes in defensive barriers, not a single reckless actor
SEE THE PRACTICE
Turn a thought this research explains into one clear move.
THE THOUGHT
“Everyone remembers me as the outage guy”
YOUR RECORDED RESPONSE
“The system failed through conditions I didn't control alone. I'm a contributor, not the root cause.”
ONE PRIVATE MOVE
Open the incident channel. Find one incident with your name. Read only the system failure section—the actual root cause. Notice whether the cause is something you alone decided to do, or a condition that existed. Write down the condition. Close the document.
Key findings
- 1990
In Human Error, Reason argues that accidents in complex systems result from the alignment of multiple latent failures across organizational, supervisory, and operational levels — not from a single person's mistake. This reframes 'who to blame' as 'what conditions allowed this.' Human Error ↗