Use case modelling is a process for identifying and modeling business events, who initiated them, and how the system should respond to them.
The intended functionality of a new system is described in a use case model. An interaction between a user (human or machine) and the system is represented by a use case. This interaction counts as a single meaningful labor unit, similar to Create Account or View.
Each use case outlines the functionality that will be implemented in the suggested system, which may expand the functionality of another use case or incorporate additional behavior. 'Actors' are human or computer entities who use or interact with the system to execute a meaningful task that aids them in achieving a goal, and they are often tied to use cases.
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