Script supervisor is the person whose job it is to keep meticulous track of a myriad of details during the shooting ofthat is, the perfect continuation of all the details recorded on film from scene to scene. Originally known as the script girl, the job is also known as continuity girl, continuity clerk, and script clerk.  Essentially a secretarial job, this is one of Hollywood’s most  demanding and important work assignments.

The scenes of a film are almost always shot out of sequence; therefore, the script supervisor must keep track of what has transpired during each take of every scene, logging such information onto continuity sheets as the camera angle, the lens used, changes in dialogue from the script, physicalclothing, and so on. For example, if a character approaches a door wearing as responsibility to
make sure that the character is wearing the same jacket and tie (in the same condition) when he opens that door and steps inside a room, even though the two scenes might be shot weeks apart.

The precise and thorough work of the script supervisor comes into play not only during filming but also during the editing process. When the shooting is finished, the continuity  sheets prepared by the script supervisor are far more important to the director and the editor than the original shooting script because they represent a log of what was actually filmed, making editing (from an organizational standpoint) considerably easier.