The stage manager has to work with the director, and ascertain whether both the director's objectives and the perceptions of the stage designers are compatible and realistic. They are usually the link between the director and the rest of the company, and are responsible for the director's visions being passed down to each actor and member of the running crew. They are also responsible for safety and running an orderly backstage area. They maintain the prompt book and the call board, to which rehearsal schedule notes are affixed for the cast.