premise: The Secret of My Success (sometimes stylized as "The Secret of My Succe$s") is a 1987 American comedy film produced and directed by Herbert Ross, and starring Michael J. Fox and Helen Slater. The screenplay was written by A.J. Carothers, Jim Cash and Jack Epps, Jr. from a story written by Carothers.
hypothesis: The story of the film was written by 1 person. 
reason: The story was written by AJ Carothers, so it was written by one person, the screenplay was written by more than one person though. 