Best quote from a prof this week

"If I don't know what I don't know, how do I know that I do not know what I do not know?"

Edit: putting this into context.

We were talking about the Denver Airport baggage system disaster of an implementation. The people in charge were supposed to pin down certain unknowns. But, they did not know what the unknowns were because they had never done that type of project before, nor did they do their research to learn about them. So how can they be held accountable for not answering the unknowns?