12.1简史 1960分析建摸 12.2分析模型的元素 分析模型必须达到三个主要目标: (1)描述客户的需要; (2)建立创建软件设计的基础; (3)定义在软件完成后可以被确认的一组需求

一、OOA的基本过程 二、需求陈述 三、建立对象模型 四、建立动态模型 五、建立功能模型 六、定义服务

Difficult Person Hostile-aggressie Bullies, cverwhelms, and intimidates cthers nd up to the hostile ade frot atoers-can t accept feedback on t rush into the worst thing that coul happen?)

opyright Nancy Leveson, Sept. 1999 Stage 1: Forming Team members begin to discover what behaviors are acceptable Usually highly unstructured environment Attempt to identify tasks, how to accomplish them Decisions on what information is needed Hesitant participation

Reuse (Assume have source code, not a commercial product) Ariane 5. Therac-25. British AtC Expectation Significantly lower development costs and time. Amortize costs among all users or uses Assumptions

一、需求分析概念 二、需求分析过程 三、需求分析方法 四、需求分析产品

Outline: Software Design Goals History of software design ideas Design principles Design methods Life belt or leg iron?(Budgen)

Abstract Model Specifications Build an abstract model of required software behavior using mathematically defined(perhaps using axioms )types(e. g sets, relations) Define operations by showing effects of that operation on the model Specification includes Model

Evolutionary Model Prototyping- \Do it twice to assess feasibility to verify requirements May only be a front end or executable specification Or develop system with less functionality or quality attributes °3 approaches:

2.1基于计算机的系统与计算机系统