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Ifølge artikkelen "Known knowns, known unknowns, unknown unknowns and the propagation of scientific enquiry" skal tidligere forsvarsminister Donald Rumsfeld ha påpekt:

"There are known 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 do not know we don't know."

DEt finnes dessuten er fjerde område; There are belived knowns. That is to say, there are things that we believe that we know"…