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ChristianKl comments on The Octopus, the Dolphin and Us: a Great Filter tale - Less Wrong
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Can somebody explain to me why people generally assume that the great filter has a single cause? My gut says it's most likely a dozen one-in-a-million chances that all have to turn out just right for intelligent life to colonize the universe. So the total chance would be 1/1000000^12. Yet everyone talks of a single 'great filter' and I don't get why.
Pareto principle.
There also the Fermi formula.
I think you need to explain your meaning more
The Pareto principle is the 80-20 rule. Meaning if there are 4 great filters each with an effectiveness of 0.9,0.9,0.99, and 0.9, it will be the 0.99 filter that requires ten times the attention / luck and will get the name 'Great', even if there are many other hurdles adding to the end result.
This is a troubleshooting problem where we are still on the first stage of the diagnosis: Identifying the largest contributor to the problem, identifying the low hanging fruit. The whole filter that prevents life on every planet is going to the a combination of many stacked smaller filters, but we want to find the most relevant filter, either the 0.999 filter or the locally relevant filter. This discussion is all part of that diagnostic process to find the most relevant single cause.