premise: Caddyshack is a 1980 American comedy film directed by Harold Ramis and written by Brian Doyle-Murray, Ramis and Douglas Kenney. It stars Michael O'Keefe, Chevy Chase, Rodney Dangerfield, Ted Knight, and Bill Murray. Doyle-Murray also has a supporting role. The film was later dedicated to producer Douglas Kenney, who died shortly after the film's release.
hypothesis: caddyshack was written by three separate people
reason: it states it was written by Brian, Ramis and Douglas