[walterbell]

You may like Philip Armour's Five Orders of Ignorance, http://www-plan.cs.colorado.edu/diwan/3308-07/p17-armour.pdf

"0th Order Ignorance: Lack of Ignorance. I have 0OI when I (probably) know something.

1st Order Ignorance: Lack of Knowledge. I have 1OI when I don't know something. With 1OI we have the question in a well-factored form.

2nd Order Ignorance: Lack of Awareness. I have 2OI when I don't know that I don't know something.

3rd Order Ignorance: Lack of Process. I have 3OI when I don't know a suitably efficient way to find out I don't know that I don't know something.

4th Order Ignorance: Meta-ignorance. I have 4OI when I don't know about the Five Orders of Ignorance. "

[fsloth]

Thanks! That was a new one. But now I am perplexed is Dunning-Kruger effect the result of 4OI or "just" 3OI :)

[jmnicolas]

For some reason I picture Rumsfled and his "unknown unknowns" ;-)