Domain

A domain defines the relevant area of knowledge, activity, or responsibility for a system.

It includes business processes, actors, rules, concepts, events, and real-world objects. Therefore, it provides the background for understanding requirements.

Requirements engineers analyse this area to learn how the business operates. For example, they examine stakeholder activities, business rules, external systems, and technical conditions. Moreover, they document important terms in a glossary.

A domain model represents key concepts and their relationships. In addition, process and interaction models can describe relevant activities and behaviour.

Teams also identify assumptions and constraints. For example, a system requirement may depend on a specific environmental condition. If that condition changes, the system may no longer meet the requirement.

Clear domain knowledge improves communication, reduces ambiguity, and supports accurate requirements and suitable solutions.