As you write the use case narrative, adhere to the scope of the project initiation phase.
Describe only what the actor can see from outside the system and \avoid describing what you think is going on inside the system.
Technically, you have not designed the system yet, so there is no inside to describe.
Question: What is the scope of the project initiation phase
This standard specifies the Unified Modeling Language (UML) with the objective of providing system architects working on object analysis and design with one consistent language for specifying, visualizing, constructing, and documenting the artifacts
of software systems, as well as for business modeling.
This standard represents the convergence of best practices in the object-technology industry. UML is the proper successor to the object modeling languages of three previously leading object-oriented methods (Booch, OMT, and OOSE). The
UML is the union of these modeling languages and more, since it includes additional expressiveness to handle modeling problems that these methods did not fully address. One of the primary goals of UML is to advance the state of the industry by enabling object visual modeling tool interoperability. However, in order to enable meaningful exchange of model information between tools, agreement on semantics and notation is required. UML meets the following requirements: