Bittner and Spence write that special requirements (requirements that do not apply to the whole system) can be placed into a use case, and could thus be accessible to the high-level test case writer.

Bittner和Spence曾经写到，可以将具体的需求(并不运用到整个系统的需求)置于一个用例中，这样对高水平测试用例的编者来说也更容易接近。

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