Originally Posted by John Marsh
Perhaps this only seems 'primary' because all the other holes in the Swiss cheese lined up.
The Swiss cheese is a wonderful metaphor, otherwise it would not have persisted for thirty years.
But I wonder sometimes whether the people who use the metaphor actually remember the theory behind it. The cheese has layers. What are the layers called? And how does the theory apply to the Congonhas accident, in detail?
PBL