Controllability is the capability of the test system to force the Implementation Under test (IUT) to receive inputs in a given order.

可控性是指测试系统控制被测实现(IUT)按照一定顺序接收输入的能力。

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The original test theory for the communication protocol test models the implementation under test (IUT) as a black box.

原有通信协议测试理论将被测实现作为黑盒，使得大量可增强控制观察能力的手段无法利用。

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