 Spec scripts are usually penned by unknown professional screenwriters and amateur screenwriters.There are a legion of would-be screenwriters who attempt to enter the film industry, but it often takes years of trial-and-error, failure, and gritty persistence to achieve success.In "Writing Screenplays that Sell", Michael Hague writes, "Screenplays have become, for the last half of [the twentieth] century, what the Great American Novel was for the first half.