Supports the 1st AD — call sheets, background action, and keeping the set quiet when it needs to be.
1st Assistant Director
Not your call
Calling the shot itself is the 1st AD's job — yours is everything that makes that call possible.
First move
Learn the call sheet cold before the crew does — you're the one they'll ask.
Titles are usually given to whoever's already doing the work — if that's you, say so.
Also in Production