并从基本工作单位层次、中间层次和制度层次三个层次对这三种模式进行分析比较。

Then the author analyzes and compares these three models from three levels, the basic working unit level, the middle level and the systematic level.

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对于极其复杂的单位来说，这个层次可以再细分到子层次：部门、部门间以及部门内。

For extremely complex organizations, this level can be subdivided into sublevels: division, interdepartmental, and intradepartmental.

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可扩展且可用于单个地或以多个单元为单位测试程序代码的层次结构。

Extensible and can be used to test a hierarchy of program code either singularly or as multiple units.

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