That's why I'm skeptical of people who look at some catastrophic failure of a complex system and say, "Wow, the odds of this happening are astronomical. Five different safety systems had to fail simultaneously!" What they don't realize is that one or two of those systems are failing all the time, and it's up to the other three systems to prevent the failure from turning into a disaster.
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Raymond Chen on Swiss cheese problems:
That's why I'm skeptical of people who look at some catastrophic failure of a complex system and say, "Wow, the odds of this happening are astronomical. Five different safety systems had to fail simultaneously!" What they don't realize is that one or two of those systems are failing all the time, and it's up to the other three systems to prevent the failure from turning into a disaster.
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