该模型使用起来很简单，因为 ClearQuest Designer 中的正常工作流程能够完全支持该模型，而且它维护起来也很简单，因为一次只有一个人在处理一个方案。

This model is simple to use because it is fully supported by the normal workflow in the ClearQuest Designer and it is easy to maintain because only one person is working on the schema at a time.

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