,

Daniel Kahneman – Thinking, Fast and Slow (2011)

…the proper way to elicit information from a group is not by starting with a public discussion but by confidentially collecting each person’s judgment. This procedure makes better use of the knowledge available to members of the group than the common practice of open discussion.

(he said this only slightly differently earlier, but it is both broader and more concise here, and bears repeating)

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