Which notation is primarily used for describing information systems requirements?

The Unified Modeling Language (UML) is primarily used for describing information systems requirements as it provides a standardized way to visualize the design of a system. UML encompasses multiple diagrams, such as use case diagrams, class diagrams, and sequence diagrams, which are specifically designed to capture various aspects of system requirements, including the interactions between users and the system, as well as the static and dynamic structure of the system itself.

In the context of modeling information systems, UML plays a significant role in ensuring that all stakeholders have a clear understanding of system capabilities and behaviors. This is essential for developing comprehensive requirements that align with business needs and facilitate effective communication among technical and non-technical stakeholders.

While other notations mentioned have their applications, they are generally not as comprehensive for depicting the specific nuances of information systems requirements. Event-driven process chain (EPC) focuses more on business process workflows, and Business Process Model Notation (BPMN) is better suited for modeling processes rather than detailed system requirements. Swim lane diagrams, while useful for clarifying responsibilities in processes, do not specifically address the intricacies of system requirements in the same way UML does.