I heard of this practice supposedly used by the US Forest Service. It goes like this;

At the beginning of a meeting, participants are asked to think about and legibly write down their own answers to questions like the following:

a) What are the best things you can imagine coming out of this meeting? b) What are the worst things you can imagine coming out of this meeting? c) What behaviors do you think would make the difference between good outcomes and bad?

Participants then post their answers on a wall in the meeting room and take a break to look over each other's answers (perhaps with coffee and donuts).

Then the meeting begins.

There is no discussion of what people wrote and no effort to craft agreed-on rules of behavior. The exercise above, by itself, is said to orient people towards constructive group behaviors.

-- Tom Atlee