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Håkan mentioned the collaborative working method "Devising" during his 17 minutes presentation, and here are some links.
Devised theatre (also called collaborative creation, particularly in the United States) is a form of theatre where the script originates not from a writer or writers, but from collaborative, usually improvisatory, work by a group of people (usually, but not necessarily, the performers). This is similar to commedia dell'artebusking. and street theatre such as

