Whether a development project is focused in a new business area or on providing new functionality, validated business use cases are a crucial element of RUP.
无论开发项目所关注的是一个新的业务领域还是提供新的功能，验证业务用例都是RUP的一项至关重要的组成部分。
Reuse of assets can in many cases lead to reduced project cost; and for proven assets, their reuse often means higher quality in new applications.
在很多情况下资产的复用导致更低的项目成本；而对经过验证的资产，对它们的复用通常意味着新应用程序的更高质量。
Test plan: Includes test cases for the new project.
测试计划：其中包括项目的测试用例。
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