A procedural drama or procedural is a cross-genre type of literature, film, or television program that places emphasis on technical detail. A documentary film may also be written in a procedural style to heighten narrative. A popular subgenre is the police procedural. Some dramas include a lab or high-tech conference room where the main characters meet to work out the problem. Television shows usually have an episodic TV format that does not necessarily require the viewer to have seen previous episodes. Each episode typically has a self-contained, stand-alone plot that is introduced, developed, and resolved in one episode.