Why did you change the horse to a nun? adaptations

"An examination of the often bewildering decisions made in film adaptations, this program considers some of the challenges inherent in turning a novel or play into a script for the large or small screen. It questions responsibility to source material and presents the experiences and opinions of adapters and adaptees."
"Eight successful writers as panelists discuss their experience of adaptations from original books and/or plays into plays or big screen and television movies, incorporating the audience's comments and questions."
"Successful adaptors (who have also worked variously as novelists, playwrights, film producers & directors) discuss their experiences adapting works into plays, screen and television movies. Includes audience questions."@en