OpenP2P.com: In-Room Chat as a Social Tool

OpenP2P.com: In-Room Chat as a Social Tool: "There were two bits of organizational structure that also helped shape the meeting. The first was our adoption of Jerry Michalski's marvelous 'Red Card/Green Card' system, where participants were given a set of colored cards about 20 cm square in three colors, red, green, and gray. The cards were used to make explicit but non-verbal commentary on what was being said at the time. A green card indicates strong assent, red strong dissent, and gray confusion."