此图已经在图13中显示过了，并且表示系统用例模型。
This diagram has already been shown in Figure 13, and represents the System Use Case Model.
用例模型有两种基本风格：基本用例模型和系统用例模型。
There are two basic flavors of use case models: essential use case models, and system use case models.
结果产生的系统用例模型如图13所示，并且包括已确定的所有用例。
The resulting System Use Case model is shown in Figure 13, and includes all the use cases identified.
此外，发起那些方法的业务操作者将追溯到相应的位于系统用例模型中的系统参与者(用户角色)。
Moreover the business workers that initiate those methods are to be traced to corresponding system actors (User Roles) living in the system Use Case model.
RUP的文档显示了从业务用例模型到业务对象模型和系统用例模型的演进；我们发现这是非常正确和有帮助的。
The RUP documentation shows the evolution from business use-case model to business object model and system use-case model; we found this to be quite accurate and helpful.
例如，如果决定必须自动化scheduler操作者，那么图11中所示的序列图提供有用的信息来创建Scheduler系统用例模型。
If, for example, it is decided that the Scheduler worker has to be automated, the sequence diagram shown in Figure 11 provides useful information to create the Scheduler System use Case model.
12在《The Object Advantage》(addison -Wesley, 1995，第173页)，E.A. Jacobsen介绍了一个算法，用于映射一个业务用例模型到一个系统用例模型。
12in The Object Advantage (Addison-Wesley, 1995, pg.173), E.A. Jacobsen introduces an algorithm used to map a business use case model onto a system use case model.
当建立用例模型的时候，您必须确保每个启动被某种类型的系统响应访问到。
As you model your use case, you must ensure that every initiation is addressed by some sort of system response.
在前面的专栏文章中，我们构建了一个用例模型，参与者在其中表示与系统交互的外部实体。
In previous columns, we have established a use case model in which actors represent external entities that interact with our system.
完成后的用例模型应该允许所有的利益相关者看见系统是如何支持他们的角色的。
The completed use case model should allow all the stakeholders to see how the system supports their roles.
这应该包括业务用例的集合、补充的系统规范和业务对象模型。
This would have included a set of business use cases, supplementary system specifications, and a business object model.
因此，可以对该模型进行扩展，使其包括系统操作所有方面的用例。
As such, the model can be extended to include use cases for all aspects of the system operation.
用例模型描述了各种参与者(人和其他系统)和要分析的系统之间的主要交互。
A use case model describes the major interactions between actors (human and other systems) and the system under analysis.
用例模型应该将系统放到上下文环境中，显示系统和外部参与者之间的边界，并描述系统和参与者之间的关键交互。
The use case model should place the system in context, showing the boundaries of the system and the external actors as well as describing the key interactions between the system and the actors.
图2显示了贷款处理系统最初的用例模型。
Figure 2 shows the original use case model for the loan processing system.
在所恢复的遗留系统的抽象结构中(与系统用例相关联的分析模型)，我们现在必须找到实现它的信息系统的组件。
From the recovered abstract structure of the legacy system (the Analysis Model associated to the system Use Cases), we must now find the components of the information system that implement it.
在项目的早期计划阶段，完成一个用例模型，它包含了所有角色的列表(用户或者外部系统)，以及系统中用例，它们的名字，以及一个简单的介绍。
Early in the project a use case model is made, containing a list of all actors (users or external systems) and use cases in the system, their names, and a brief description.
用例应该说明系统如何支持域和业务流程模型中的业务流程。
The use cases should tell the stories of how the system supports the business processes in the domain and business process models.
创建用例模型的要点是减小错误构建系统的风险。
The point of creating use case models is to mitigate the risk of building the wrong system.
第二，分析用例来构建表示软件推测架构的系统分析模型。
Second, the use cases are analyzed to build the system analysis model that represents a hypothetical architecture for the software.
PiggyBank范例被分成三个UML模型，每个模型都描述了系统的不同方面：用例模型，分析模型和设计模型。
The Piggy Bank sample is divided into three UML models that each describe a different aspect of the system: the use-case model, analysis model, and design model.
用例可以指定一个完整的系统，也可以指定任何描述行为的模型元素，例如子系统。
A use case can either specify a complete system or any model element that describes behavior, for example, a subsystem.
图17中显示了您如何描述模型中的用户目标，并且将系统的用例绑定到这些目标上。
Figure 17 shows how you can describe User goals in the model, and tie the system's Use Cases to these goals.
这就允许我们从一种业务观点来评价用例模型的完整性，因为每个系统用例必须支持一个或更多的业务用例。
This allows us to evaluate the completeness of the use-case model from a business perspective, as each system use case must support one or more business use cases.
用例模型提供有关您正在开发的系统或应用程序的行为的详细信息。
The use case model provides detailed information about the behaviors of the system or application that you are developing.
因为大部分软件系统支持多个目的，大部分用例模型由多个用例组成。
Because most software systems support many goals, most use case models will consist of many use cases.
第一，用例模型是用例恢复系统所支持的业务过程模型。
First, the use cases are used to recover the business process model the system supports.
到现在，我们已经建立了提交贷款请求用例的模型，但是这个用例实际上只是一个较大的贷款处理系统的一部分。
Thus far we've modeled the submit loan request use case, but this use case is actually part of a larger loan processing system.
此系统用例可以用于说明点到点事务模型的概念及其在项目的体系结构设计阶段的变化。
This system use case can be used to articulate the concepts for the point-to-point transactional model and its variations for the architecture phase of a project.
此用例描述数据如何在使用点到点事务模型的系统间流动。
This use case describes how data flows between two systems that use a point-to-point transaction model.
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