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It is the assistant director's responsibility to set up rehearsals and read-throughs with the cast throughout the shoot. He serves as a liaison between the director and the cast and crew and is there to buffer any questions or disagreements to keep the shoot running smoothly.
During the actual shooting of scenes, the assistant director makes sure everyone and everything is lined up for the director to get his shots completed. The A.D. gets actors to the set and in their places and calls for quiet on the set. He also makes sure that all extras are in place and are doing their jobs.
At the end of each work day, the A.D. is responsible to report an update to the production manager concerning the breakdown of extras, stunts, vehicles, effects and multi-camera days. If the scene required to be shot is outside where everyone will be exposed to the elements, the A.D. must be up to par with the latest weather forecast and schedule accordingly with a backup schedule in case the weather will delay the shooting schedule.