 Joel Schumacher's script for The Wiz was influenced by Werner Erhard's teachings and his Erhard Seminars Training ("est") movement, as both Schumacher and Diana Ross were "very enamored of Werner Erhard". "Before I knew it," said Rob Cohen, "the movie was becoming an est-ian fable full of est buzzwords about knowing who you are and sharing and all that. I hated the script a lot. But it was hard to argue with [Ross] because she was recognizing in this script all of this stuff that she had worked out in est seminars." Schumacher spoke positively of the results of the est training, stating that he was "eternally grateful for learning that I was responsible for my life." However, he also complained that "everybody stayed exactly the way they were and went around spouting all this bull * * * *." Of est and Erhard references in the film itself, The Grove Book of Hollywood notes that the speech delivered by Glinda the Good Witch at the end of the film was "a litany of est-like platitudes", and the book also makes est comparisons to the song "Believe in Yourself". Although Joel Schumacher had seen the Broadway play before writing the script, none of the Broadway play's writing was incorporated into the film's.
