The document describes the architectural design process for a Library Circulation System. It includes 4 steps: 1) Representing the system context, 2) Defining archetypes, 3) Refining the architecture into components, and 4) Describing system instantiations. It then covers the component design process, including identifying classes, elaborating classes, describing data sources, and developing behavioral representations. Finally, it discusses the user interface design process, including analyzing users and tasks.