An assistant director (AD) is an individual on a film crew responsible for tracking daily progress against the filming production schedule, arranging logistics, preparing daily call sheets, checking cast and crew, maintaining order on the set, and the health and safety of the crew. The role of an assistant director may be broken down into subroles, although roles beyond 2nd AD is rarely seen on Smosh:
- The first assistant director (1st AD) has overall AD responsibilities and supervises the 2nd AD. The 1st is directly responsible to the director and keeps the production on schedule throughout the day, communicates to the crew, and maintains the safety and security of the staff and shot itself.
- The second assistant director (2nd AD) creates the daily call sheets from the production schedule (in cooperation with the production coordinator) and serves as the "backstage manager".
- The third assistant director (3rd AD) works on set with the 1st AD and may liaise with the 2nd to move actors from base camp, organize crowd scenes, and supervise one or more production assistants.
- The fourth assistant director (4th AD) or additional assistant director (AAD) or key production assistant may have a number of duties; most commonly, the 4th has two broad job functions: the contraction of the duties of an AD where the AD acts as both 2nd AD and 3rd AD simultaneously, and adjunct to the 3rd AD and 1st AD for logistically large scenes where more ADs are needed to control large numbers of extras.
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