一个通常的问题是用例模型爆炸式快速增长，特别当你正在业务需求的抽象层工作的时候。
A common problem is that the use case model explodes in size very quickly, especially when you are working on the abstraction level of business requirements.
太多分析人员在抽象模型内单独工作，他们的分析受到的制约是有限的。
Too many analysts work solely in abstract model-land with limited constraints to drive their analysis.
随着模型从抽象元素转移到具体元素，功能被分配到软件、硬件、固件和工作者，并且元素之间的协作被最后确定下来。
As the model moves from abstract to concrete elements, functions are allocated to software, hardware, firmware, and workers, and the collaborations between elements are finalized.
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