One Flew Over the Cuckoo's Nest (1962) is a novel written by Ken Kesey. Set in an Oregon psychiatric hospital, the narrative serves as a study of institutional processes and the human mind as well as a critique of behaviorism and a tribute to individualistic principles. It was adapted into the broadway (and later off-broadway) play One Flew Over the Cuckoo's Nest by Dale Wasserman in 1963. Bo Goldman adapted the novel into a 1975 film directed by Milos Forman, which won five Academy Awards.

Can we conclude that is one flew over the cuckoo's nest a true story?
no