One of the most popular consultant visuals is the one that
divides the topic in hand into things we know we know, things we know we don’t
know, things we don’t know we know, and things we don’t know we don’t know.
It’s a useful diagnostic tool.
Of course, there’s another category, not captured by the
graph, but neatly expressed by the American cowboy Will Rogers (or was it wise
Mark Twain?):
It's not the things you don't know what gets you into
trouble. It's the things you do know that just ain't so.
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