在统一建模语言和面向对象方法学中，用例是获取需求的主要工具。

Use cases are primary tools of eliciting requirements in UML and object-oriented methodologies.

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国际上近几年来面向对象软件方法学领域取得了远多于前几年的成果。

Much more achievements have made than ever in the field of Object Oriented software methodology during the most recent years.

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面向对象模型基于方法学原理，关系数据模型基于集合论原理，理论基础的不同导致了两种模型之间的阻抗不匹配。

The Object oriented model is built on methodology, while the relational data model is on basis of the set theory. The difference principal between the two models leads to the dispatch problem.

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