What is the purpose of a prompt book?

The purpose of a prompt book is to serve as a comprehensive reference guide for the stage manager, detailing all cues and notes necessary for the smooth operation of a production. This book typically includes the script with cues annotated for lighting, sound, and scene changes, as well as any additional notes about blocking and timing. The stage manager relies heavily on the prompt book to coordinate the various elements of a show, ensuring that everything runs according to plan during performances.

In contrast, while a reference guide for actors' lines might seem relevant, it does not encompass the broader responsibilities and features that a prompt book contains. Similarly, while a marketing tool or a budget plan may be important for the overall production, they serve different purposes and do not address the specific needs of managing the performance itself.