We use the term  Responsibility domain  (RD) as a synonym for Role when it is desirable to focus on the ownership aspects of a Role. Domain emphasizes the cohesiveness of the set of responsibilities that define the Role. You can draw a boundary around something that has a cohesive set of responsibilities and call it a responsibility domain. Lines drawn to the Roles it calls upon in order to fulfill its responsibilities identify its collaborators. The responsibility domains which call upon it are its "clients." You can think of the responsibility domain as providing service to its clients. The accountability of an area of the company can be simulated by tracing behavior through responsibility domains.

Relationship of domain to its stakeholders and the domain responsible for modeling it

Responsibility may belong to person, group, or inanimate object. It is a deeper concept than task. It may encompass many tasks.

Responsibility for defining responsibility also belongs to a domain. It is easy to identify that domain; it should include (human) representatives of all of the stakeholders of a Responsibility Domain. You can find stakeholders directly from the connectivity of the Role Model. They’re the ones with lines connecting them to the domain.

Responsibility Domains

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