Pos store data synchronization-System Modeling (1)

A project must start with a requirement, whether directly raised by the customer or raised by the superior.

Corresponding to Rose is the use case diagram.

The use case diagram consists of use-case and business use-case)

The difference between the two is simply

Business and system use cases are planned from the customer's business perspective and system construction perspective respectively. Business Use Cases are not close, but completely direct requirements. system use cases are not detailed division of business logic, but the implementation method of the system's requirements, but notProgramDesign is irrelevant. It only means that the functional requirements of the system to be built are composed of these system use cases.

I personally think that there is no need to be so careful in the use of general projects. The two can be combined.

For example, our design scheme. The business use case should be like this

 

The system use case should be as follows:

 

We can see that business use cases are closer to the user's understanding. We should consider different situations when doing analysis and modeling (when using system use cases. Then prepare for the next step.