3 ms·
The Rumsfeld formulation itself dates to at least the 1950s and development of the Johari window (named for Joseph Luft and Harrington Ingham). I'd first encou
by dredmorbius 3y ago
The Rumsfeld formulation itself dates to at least the 1950s and development of the Johari window (named for Joseph Luft and Harrington Ingham).
I'd first encountered it in print in a 1982 book, Forced Options, by Roger Lincoln Shinn, two decades before Rumsfeld's famous 2002 usage:
<https://archive.org/details/forcedoptionssoc0000shin_c8x7/page/10/mode/2up?q=unknown+unknowns https://archive.org/details/forcedoptionssoc0000shin_c8x7/pa...>