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需求文档分析工具（ＲＤＡＴ）是青鸟Ⅱ型系统中的一个支持结构化开发方法的ＣＡＳＥ工具。本文首先简要介绍ＲＤＡＴ系统的设计背景，然后较详细地描述了用面向对象建模技术（ＯＭＴ）设计和实现系统的全过程。
Demand Document Analysis Tool (RDAT) is a CASE tool that supports structured development methodology in Jadebird’s Type II system. This paper starts with a brief introduction to the design background of RDAT systems and then describes in more detail the whole process of designing and implementing a system using Object Oriented Modeling (OMT).