Groups of 12 to 15: The next interesting number is around 12. Twelve is small enough to build trust and intimacy, and small enough for a single moderator, if there is one, formal or informal, to handle. (When multiple facilitators are required at a large meeting, it is customary to divide the number of participants by 12 to figure out how many facilitators are needed.) At the same time, 12 is large enough to offer a diversity of opinion and large enough that it allows for a certain quotient of mystery and intrigue, of constructive unfamiliarity. In Sustained Dialogue, our groups were always
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