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

Fairly primitive and predictive power limited Function Points Count number of inputs and output, user interactions, external interfaces files used Assess each for complexity and multiply by a weighting factor Used to predict size or cost and to assess project productivity

上海交通大学：《形象思维与工程语言》教学资源_课件_计算机绘图技术-AutoCAD绘图技术

大约20年前,软件工程人员对做完的程序将不再 关心,犹如过时的报纸,程序被束之高阁或弃而不问。到1988年,软件界第一次提出“千年虫问题” ,工程人员不得不从洪水般的源代码中去寻找“时 间变量”。虽然,所需修改的仅仅是变量的类型或 长度,但在全球的软件行业中却掀起了巨大的波澜

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?)

一、功能 1.图书(书名、著、译者、出版社、单价、书号、出版时间)、期刊(期刊名、卷号、期号、主办单位)基本情况录入 2.借书登记(读者名,书名、借书日期、该读者已借书册数)

1引言 1.1编写目的 说明编写这份软件需求说明书的目的,指出预期的读者。 1.2背景 说明:

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

Can programming language influence correctness? anguages affect the way we think about problems The tools we use have a profound(and devious) influence on our thinking habits, and, therefore on our thinking abilities?

State Machine specifications Define behavior using states and transitions between states