And while logical decomposition is often essential, it is not sufficient for system modeling.
虽然逻辑分解常常是必要的，但是对系统建模来说是不够的。
It does this by modeling the logic flow within your system, detailing interactions between your application's class methods and allowing you to journal method entries and exits.
时序图利用建模系统的逻辑流程，详细描述了应用程序中各个类之间交互的系统方法，并且允许你对方法的入口和出口进行分类。
Use case modeling is used in IT projects to capture the functional requirements of a system.
用例建模在IT项目中用于捕获系统的功能需求。
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