Documentaries typically follow certain conventions in their structure, camerawork, lighting, editing, sound, and graphics. Narratives are usually single-stranded for simplicity and to educate audiences. Camerawork focuses interviews in the rule of thirds and keeps subjects stationary. Lighting highlights key points and creates atmosphere. Editing uses cuts and transitions to make interviews and answers coherent without needing included questions. Voiceovers and music are used to link topics and maintain interest.