A less known but highly essential artifact of business architecture is the business use case model.
A business use case (hereafter referred to as BUC) model is the higher abstraction of the system use case model (or simply, the UC model). In a BUC, business actors with specific business goals interact with other business actors. The BUC is primarily an external view of the business model or area of interest. A system use case diagram, on the other hand, illustrates the domain from an internal point of view.