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Weten of niet weten, dat is de vraag

The message is that there are no knowns.
There are things we know that we know.
There are known unknowns.
That is to say there are things that we now know we don't know.
But there are also unknown unknowns.
There are things we don't know we don't know.

Auteur: 
Donald Rumsfeld

Informatiemodel:

Datum eerste publicatie: 
dinsdag, 7 augustus 2012 - 6:30pm
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