OO System analyst Path--use Case Analysis Series (2)--use case type and granularity

Before formally discussing how to get the use case, I think there are two issues that can be explained well first, which is helpful for getting the use cases right. These two problems are the most confusing for beginners, but also the most difficult to master. One is the difference and usage between the various use case types, and the other is the granularity of the use case.

Let's first talk about the use case type problem.

Use case type, some materials translated into version, the original English is stereotype. The default type in Rose is business usecase, business usecase realization and use case realization three. Correspondingly, that is to refer to

Business Use cases:

Business use case implementation:

Use Case implementation:

If you do not specify a type, then it is the use case in the usual sense: