需求分析的任务还不是确定系统怎样完成它的工作,而仅仅是确定系统必须完成哪些工作,也就是对目标系统提出完整,准确,清晰,具体的要求-Mission needs analysis of how the system is not yet completed its work, but simply to identify what kind of work must be completed, but also on the target system is complete, accurate, clear and specific requirements