Interns: Interns are more common to commercial casting offices which host as many as a dozen different casting directors holding different auditions per day. While some commercial casting offices hold permanent casting space, many rent out studios on a project to project basis. A key intern will work with many busy casting directors sorting mail, copying sides and transcribing them onto "cue cards" or large boards to be read off of as prompts in the casting room, help actors sign in, and keep the flow of actors going in and out of the casting room as smooth as possible.