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A major movement in a story, often ending on a shift in goal or stakes.
An act is a stretch of story bounded by a turn in goal, strategy, or stakes — not a fixed page count. Many novels use three acts; others use two, four, or none at all while still changing pressure over time.
Acts help you diagnose sag: if the middle feels endless, you may need a midpoint turn or a clearer act break rather than more events.
Why it matters
Act language lets you talk about macro shape in revision and align Scene Builder sequences with dramatic movement.
Common pitfalls
Act one ends when the courier burns the safe house — the hero can no longer pretend this is someone else's problem.