This Use Case Diagram Template depicts the steps involved in writing and publishing a book. Using this diagram in your use case scenario, whether you're an author, an agent, or a bookseller can help your team publish the next big hit. To get started, use this sample template. This template can also be used for any process in which a customer purchases a service. This use case diagram in the Unified Modeling Language can summarise the details of your system's users and their interactions with the system.