There are several types of narrative structures that can be used in documentaries. A closed narrative has a clear beginning, middle, and end with no loose ends. An open narrative leaves some questions unanswered and has no defined ending. A linear narrative presents events in chronological order, while a non-linear narrative jumps between scenes and times. Documentaries can also have single or multi-strand narratives focused on one or multiple characters, and can use circular or restricted/unrestricted narrative forms.