In use case terminology, what does the functionality of "include" enable?

The functionality of "include" in use case terminology enables a use case to utilize features from another use case. This relationship signifies that a specific use case can invoke the behavior of another use case to add common functionality, allowing for modular design and reducing redundancy.

By using the "include" relationship, a primary use case can delegate certain tasks to an included use case. This promotes reusability, as the same included use case can be reused by multiple primary use cases whenever that specific functionality is required. It helps streamline the overall process by managing and organizing complex behaviors more efficiently while maintaining clarity in the interactions among various components of the system.

In contrast, the other options suggest functionalities that do not accurately align with the concept of "include." For example, a use case standing alone without dependencies does not reflect the collaborative nature of use cases that "include" each other. Similarly, the notion of only describing basic functionality and ignoring external interactions does not encapsulate the purpose of including one use case within another. Instead, the focus is on shared behaviors and enhancing overall functionality through this relational use case design.