on Writers Helping Writers:

In any discussion of story structure, the three-act model inevitably dominates the conversation. Even as plotting methods such as Save the Cat, the Hero’s Journey, and the Snowflake Method gain popularity, the classic beginning-middle-end form reaching back to the dramatic theories of Aristotle remains the essential core.

But here’s the rub: Three-act structure produces a disproportionately large act in the middle of a novel—the double-stuff cream in the three-act Oreo—leaving writers with a puffy, gooey act notoriously recognized as the most difficult section to write. Act 2 of a three-act story is twice the length of the other acts, forcing writers to combat the infamous “saggy middle” effect using a hodge-podge of plot tangents and pacing tricks.

But it’s not the writing that makes the double-stuffed Act 2 feel like such a slog; it’s the structure itself. The loss of momentum is a symptom of a missing component that flattens plot and character development: the midpoint complication.