A business or software system can be documented by writing single requirement statements, and these statements can be greatly expanded by applying the principles of use-case design.
一个商业或者软件系统可以通过逐一记录下需求陈述来备案，这些陈述也可以通过运用用例设计的原则得到极大的扩展。
In this use case, a bank customer is applying for a credit card product using the bank's portal.
在此用例中，银行客户使用银行的门户申请信用卡产品。
Applying these principles results in a use case structure that is also layered, in the same way as the process model, as shown in Figure 2.
应用这些原则，会得到与流程模型相似的分层化用例结构，如图2中所示。
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