Chapter 10. Actors and Users
Software products are created for users, be they human beings, pieces of hardware, or other software systems. A user is a stakeholder who will interact with a completed system either directly (that is, hands on) or indirectly (for example, using reports from the system but not generating those reports personally). Users can be grouped into user classes, communities of users who have similar characteristics and similar requirements for a system.
Discussions of use cases always involve the concept of actors. An actor is an entity outside the system boundary that interacts with the system for the purpose of completing a transaction, such as a use case. Actors are related to—but are not precisely the same as—user classes. ...
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