Abstract
The graph model is presented in the form of a diagram reflecting the relationship between entities and precedents and being an integral part of the use case model, which allows describing the system at a conceptual level. A precedent is the possibility of a simulated system (part of its functionality), thanks to which the user can get a specific, measurable and desired result [1]. The precedent corresponds to a separate service system, determines one of the options for its use and describes a typical way of user interaction with the system. Use cases are typically used to specify external system requirements.
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