A continuity supervisor or script supervisor — often credited under the shortened title, continuity — is a person tasked with ensuring that scenes filmed out of narrative order make sense when edited into the proper sequence. They thus have to watch carefully as principal photography continues, and take detailed notes as to the daily progress of the film unit. They ensure that actors render the script as precisely as is needed to convey the script writer's intended meaning. They also keep an eye on visual details such as costume, make-up and props to maintain the narrative flow of the story, even though it may be filmed out of order.