What directional flow does a refine relationship have?

A refine relationship is used in modeling to indicate that one element expands or elaborates on another element, typically clarifying details or adding constraints. In this scenario, the direction of flow is from the client use case to the supplier requirement. This means that the client use case, which represents how a user or system expects to interact with a system, provides context and guidance for the supplier requirements, which are the specifications that must be met to fulfill those use cases.

When you consider the nature of a refine relationship, it emphasizes the idea that the broader, high-level concepts of client use cases guide the development of more specific, detailed supplier requirements. As a result, the relationship captures how the initial user-centered perspective is communicated to the more technical specifications needed for system development, thereby establishing a clear direction of flow from the user’s needs to the requirements that must be satisfied to meet those needs.