Bibles are updated with information on the characters after the information has been established on screen, scripts, or writer's notes. For example, the
Frasier show bible was "scrupulously maintained", and anything established on air — "the name of
Frasier's mother,
Niles' favorite professor,
Martin's favorite bar...even a list of
Maris' [dozens of] food allergies" — was reflected in the bible. The updated bible then serves as a resource for writers to keep everything within the series consistent. Other bibles are used as sales documents to help a
television network or
studio understand a series, and are sometimes given to new writers when they join the writing staff for the same reason. These types of bibles discuss the backstories of the main characters and the history of the series' fictional universe. Television series often rely on writers' assistants and
script coordinators to serve as "walking bibles" in remembering details about a series. ==Writers Guild of America==