The Swiss Cheese Principle of Avoiding Disasters

i ran out of fuel because there'd been a problem with the pump. The pump kept clicking out as i was re fuelling in tha way that indicated that the tank was full. But the fuel gauge was showing that thetank was nearly empty. So i thought i got a broken fuel gauge, and off i drove. And i was not full. There's actually a theory in accident called 'the swiss cheese principle' where you imagine each check is like a barrier to stop mistakes from getting through. Each barrier has a few holes in it, but o you just hope that if you've got enough slices of cheese, one of them will stop the mistake from get through. Every now