As a standalone use case model is frequently created per problem domain, and consequently, application development project, the enterprise-wide big picture gets blurred in many cases.
由于每个问题域常常都创建单独的用况模型，因此，应用程序开发项目，这个企业的大方向在许多情况下变得模糊。
The domain model is useful, even if you do not produce business use case realizations.
域模型很有用，即使你不提出业务用例实现。
You have to evaluate the use-case model with respect to some frame of reference, such as business needs, business domain, and so on.
你必须应用一些参考框架来评价用例模型，例如业务要求，业务领域，等等。
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