Av latinets improvisus: oförutsedd, oförmodad.

thumb|300px|right|Improvisation har också regler.


”I’d argue that a director should never demonstrate anything to an actor, that a director should allow the actor to make his own discoveries, that the actor should think he’d done all the work himself. I objected to the idea that the director should work out the moves before the production started. I said that if an actor forgot a move that had been decided on, then the move was probably wrong.”
ur Impro – improvisation and the theatre, Keith Johnstone,1979