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《软件工程》课程教学资源（图示）系统流程图的基本符号

《软件工程》课程教学资源（图示）判定表举例

《软件工程》课程教学资源（图示）判定树举例

《软件工程》课程教学资源（图示）瀑布模型

Too complex for complete analysis Separation into non-interacting subsystems distorts the results The most important properties are emergent Too organized for statistics Too much underlying structure that distorts the statistics Organized Complexity\(Weinberg) Copyright Nancy Leveson, Sept 1999

Requirements specification: A structured document that sets out the services the system is expected to provide Should be precise so that it can act as a contract between the system procurer and software developer and thus needs to be understandable by procurers and developers