You’ll have to do some thorough exploration to find the things you don’t know that don’t know. These are probably the most dangerous since these encompass what we are not aware of and therefore can’t plan, analyze or take actions to mitigate them. Unknown unknown - things we don’t know (i.e are not aware of) that we don’t know. are aware of) that we don’t know - they imply a risk, but since we know them we can measure the risk, understand it and investigate more to make this a known known. Known unknowns - things that we know (i.e. These pose less of a risk, as they are facts we are confident in. Known knowns - things that we know (i.e are aware of) that we know. This saying is typically used to conduct risk management analysis by splitting the upcoming obstacles into 3 categories: There are things we do not know we don't know. That is to say there are things that we now know we don't know.
It’s been almost twenty years since Donald Rumsfeld, the then US Secretary of State of Defense, said: "There are things we know that we know. Known knowns, unknown knowns and unknown unknowns
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