The three-act structure is a model used in narrative fiction that divides a story into three parts (acts), often called the Setup, the Confrontation, and the Resolution. It was popularized by Syd Field in his 1979 book Screenplay: The Foundations of Screenwriting. It has been falsely attributed both to Aristotle (who in fact argued for 2-act and 16-act plays) and to Aelius Donatus.