例如，用例的前置及后置条件、输入和输出定义服务依赖关系、边界和数据要求。

For example, the pre - and post-conditions, inputs, and outputs of the use case define the service dependencies, boundary, and data requirements.

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根据这个用例的目标，在测试用例的前置条件或者设置中还需要一些数据输入。

Depending on the goal of the use case, some data input will be required in the pre-conditions or setup of the test case.

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另一个前置条件是运行前述约束检测算法所需的数据，要在模型中是实际可用的。

The other precondition is that the data that is needed to run the constraint-checking algorithm defined above is actually available in the model.

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