图5：用分配给项目的在开发中的组件的颜色建模的用例实例。
Figure 5: Example of use case modeling with color assignments to the components under development for the project.
尽管用例获取用户和任务的一般化观点，但是依据具体的工作流，情境描述具体的用例实例。
Whereas use cases capture a generalized view of a user and a task, scenarios describe a specific instance of a use case in terms of a concrete workflow.
在购物车用例实例中，您必须假设对于每个对象您都有一张表，这些对象是指：Cart、CartItem、Article和ArticleDescription。
In the shopping cart use case example you must assume that you have a table for each of the objects cart, CartItem, Article, and ArticleDescription.
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