 It is a misconception that most of the film was improvised by the  actors. Jacques Rivette provided structure but did not let his  actors "go wild", instead he let them write. A single scene was  improvised, where Celine, played by Julie Berto, brags to her  associates about her rich American friend. The rest of the scenes  where shot from scripted material, mostly thanks to participating  actors. The film is collaboration by several authors, including  actors Berto, Labourier, Ogier and Pisier. Rivettes involvement in  the writing was to give structure to all the contributions,  tightening things up.