一种层次式面向对象需求模型的设计

在总结了面向对象需求分析代表性工作的基础上，提出一种新的层次式面向对象需求分析模型，在该模型中较严格地定义了层次间的精化／抽象关系，使得系统需求模型具有较好的层次结构，呈现为多版本并存的多根树，从而提高了需求模型的易理解性，易维护性和可靠性，并有利于系统的自动开发。

DESIGN OF HIERARCHICAL OBJECT-ORIENTED REQUIREMENT ANALYSIS MODEL

Function decomposition model, such as structured analysis model, used to be the main method in traditional requirement analysis. However, the inconsistency between software architecture and actual problem architecture makes such models difficult to be understood, maintained, and reused. On the contrary, the object oriented analysis model(OOAM), which is based on the real world problem architecture, plays very well in requirement analysis. In general, OOAM can describe not only the static structure relations but also the dynamic interactive behaviors within a system. But in practice, there seldom exist powerful systems that have strictly defined hierarchical structure to control the system complexity and ensure the model consistency. Based on the survey of representative works in the area of object oriented requirement analysis, this paper presents a new hierarchical object oriented requirement analysis model-HOOM. In this model, a strictly defined hierarchical structure was introduced and a corresponding model abstraction mechanism was provided. In HOOM a hierarchy consists of a static model and a dynamic model that describe static relations and dynamic behaviors in a system respectively. Based on this hierarchical structure, a formal model refinement/abstraction relation was given and a concise refine/abstract operation has been implemented. In conclusion, the system requirement model based on HOOM has a good hierarchical multi root tree structure. HOOM model can improve the system model's reliability and make the requirement definition easy to be understood, maintained and reused.