Structure is the framework upon which your screenplay stands up, and lack of a solid structure — yes, you guessed it — will result in your script falling down, or, in better terms, getting rejected by film industry folks. A solid structure with strong turning points will demonstrate to readers that you know how to craft a savvy screenplay. Succinctly following your protagonist’s journey will enable you to craft a solid structure. Regardless of your script’s genre, careful assembly and construction of each act is imperative to writing a successful screenplay.

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http://www.newenglandfilm.com/magazine/2011/12/screenplay