When composing an application, what type of module should contain the user interface and business logic specific to a particular use case or business process?

The user interface and business logic specific to a particular use case or business process are best placed within an End-User Module. This type of module is designed to encapsulate functionality that directly interacts with the end-user, focusing on delivering a seamless user experience and tailored business workflows. An End-User Module typically includes pages, screens, and any logic that pertains specifically to the functionality that users engage with, making it essential for specific use cases or business processes.

In contrast, a Foundation Module serves as a base layer that provides shared functionalities or foundational services used by other modules. A Core Module usually contains core business logic but does not focus solely on user-facing aspects. A Library Module typically holds reusable components, utilities, or helper functions that do not represent a direct interaction or specific business process for end-users. Thus, for a use case that involves both user interface and specific business logic, an End-User Module is the most suitable choice.