Research involves studying materials to establish facts and reach conclusions, which media producers do to identify conventions and aid planning. Planning organizes a media product's elements, like advertising, which is essential for success. To develop an understanding of horror films and identify conventions like scary locations, research analyzes current and past popular horror films. Planning a horror film considers the narrative, representations, sound, and including conventions like tense atmospheres to make the genre recognizable to audiences. Producers carefully plan trailers to give audiences a preview and sell the film.