1 引言 ............................................................................................................................................... 2 1 .1 编写目的 ................................................................................................................................. 2 1 .2 背景......................................................................................................................................... 2 2 任务概述 ....................................................................................................................................... 3 2 .1 目标......................................................................................................................................... 3 2 .2 用户的特点 ............................................................................................................................. 3 2 .3 假定和约束 ............................................................................................................................. 3 2 .3 .1 经济可行性分析 .............................................................................................................. 3 2 .3 .2 技术可行性分析 .............................................................................................................. 4 2 .3 .3 人员可行性分析 .............................................................................................................. 4 3 需求规定 ....................................................................................................................................... 5 3 .1 对功能的规定 ......................................................................................................................... 5 3 .2 .1 精度...................................................................................................................................... 5 3 .2 .2 时间特性要求 ..............................