Three-act structure

Where the term comes from

The idea of a story with a beginning, a middle and an end is old. In the Poetics, Aristotle writes that a whole is that which has a beginning, a middle and an end, and that the events of a plot should follow one another by probability or necessity. The modern three-act label is usually credited to screenwriting. Wikipedia notes that Syd Field described it in his 1979 book Screenplay: The Foundations of Screenwriting, with the parts often called the Setup, the Confrontation and the Resolution.

In that model the first act introduces the characters and their world and ends with a turning point that makes life impossible to go back to. The second act follows the protagonist's attempts to deal with the problem as things get worse. The third act brings the climax, where the main tension peaks and the central question is answered.

An example

Marguerite Oyelaran runs a failing bell foundry in the hill town of Tarn. In act one we see her casting the last bell for a church that has not paid in a year, and then the bishop's steward arrives to say the foundry will be seized unless she casts a bell big enough for the cathedral by midwinter. She accepts, because refusing means losing the workers who are her family. In act two she tries three ways to find the bronze: she melts the town's old cannon, which the mayor forbids, begs a rival foundry, who sets her a humiliating condition, and finally sells her father's tools, which makes her apprentice walk out. Each attempt costs more than the last. In act three the pour begins on the coldest night of the year with half a crew, the mould cracks and she has to decide whether to stop or pour into the crack. The answer to the question the story asked, will the foundry survive, arrives in the last scenes.

Common mistakes

• Making act one a long preface. Readers need the problem early, not a tour of the setting.
• Letting act two sag. If the complications do not escalate, the middle feels like repetition.
• Treating the act breaks as fixed page counts rather than turning points the story has to earn.
• Resolving the plot but not the character, so the ending answers the question and ignores the person.
• Using the model to force a story that wants another shape.

How to check your manuscript

Name the scene that ends act one and the scene that begins the climax. If you cannot, the turning points may be vague. Next, read the middle and ask whether each major scene leaves your protagonist in a worse or more informed position than the one before. For nearby terms, see inciting incident, midpoint, rising action and climax.

Musael offers a three-act template you can start from on the plan board.