User talk:Vvdeleeuw

I would have the following note, to the requirement for citation about "unknown unknowns" in the black swan theory article. But don't know how to insert it. Here is my note:

A fixed model cannot include unknown unknowns. The expression stems from Donal Rumsfeld according to Daniel Kahneman ("Thinking Fast and Slow", Penguin, 2011, p. 248). Kahneman mentions on p. 264 the "pre-mortem" technique by Gary Klein, brainstorming about ways a plan or forecast could fail, as a way to reduce the unknown unknowns.

please help

Vvdeleeuw (talk) 10:24, 6 February 2013 (UTC)