Which view includes an architecture diagram and the relationships between systems and stakeholders?

The architecture diagram and the relationships between systems and stakeholders are appropriately captured in the logical view. This view focuses on the system's organization and its components, illustrating how they interact with each other and with external entities, such as stakeholders and other systems. It emphasizes the relationships and data flows rather than the physical implementation or specific technologies used.

The logical view is essential for architects and stakeholders as it provides a high-level overview that helps in understanding the system's conceptual structure and supports discussions about the architecture without being tied down to technical specifics. This is particularly useful during the initial phases of a project when gathering requirements and planning the overall strategy for system interactions.

In contrast, the other views serve different purposes: the process view typically deals with the operational workflows and interactions over time, the development view illustrates how software components are organized in the codebase, and the physical view focuses on the actual hardware and network infrastructure where the systems reside. These views do not provide the same level of insight into the relationships and high-level architecture as the logical view does.