需求规格说明书 1.引言 ............................................................................................................................................... 1 1.1 编写目的 ............................................................................................................................. 1 1.2 项目背景 ............................................................................................................................. 1 1.3 定义 ..................................................................................................................................... 2 1.4 参考资料 ............................................................................................................................. 2 2.任务概述 ..................................................................................................................................... 2 2.1 要求 ..................................................................................................................................... 2 2.2 目标 ..................................................................................................................................... 2 2.2 运行环境 ............................................................................................................................. 3 2.3 假定和约束 ......................................................................................................................... 3 3.功能需求 ..................................................................................................................................... 3 3.1 功能描述 ............................................................................................................................. 3 3.2 数据词典 ............................................................................................................................. 8 3.3 E-R 模型 ..................................................