Mistakes happen, he theorized, because multiple vulnerabilities in a system align — like the holes in cheese — to create a ...

Renowned psychology professor James Reason, who popularized what is known as the Swiss cheese model, has died. Mistakes, Reason theorized, were really a series of vulnerabilities lining up ...

The concept is adapted from the original Swiss cheese model by James Reason. The layers are represented as protective safeguards (cheese) and weaknesses (holes). When an initiating event—one that ...