Does a use case diagram completely replace a written use case description?

A use case diagram provides a visual representation of the interactions between users (actors) and the system, showcasing the different use cases and how they relate to each actor. However, it does not capture the detailed logic, necessary steps, and specific requirements of each use case that a written use case description does.

The written use case description elaborates on the scenarios, preconditions, postconditions, and flows of events in detail, which are crucial for understanding the specific requirements and ensuring clarity for developers and stakeholders. Therefore, while a use case diagram serves as a helpful tool for visualization and communication, it cannot completely replace the written narrative that provides depth and context to each use case. This complementarity ensures that all aspects of software requirements are adequately covered.