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1·As a methodology, UML/UP have two defects in requirement specification:the requirement elicitation and specification capability is not so powerful;

UP作为方法学，在需求方面存在两大不足：需求表达能力不强；

2·Describes the principle of use case model technology, discusses the requirement elicitation based on use case modeling, sums up some experience and understanding from practice.

在描述用例建模技术原理的基础上，重点讨论了基于用例建模的需求获取，并对一些经验和体会加以总结。

3·A method, in light of the characteristics of requirement elicitation based on the ontology, was offered here to merge, associate, and align domain requirement models with the root domain ontology.

该方法通过领域的根本体对领域不同的需求模型进行合并、关联和修正等操作。