本书讲述了软件开发中一个至关重要的问题—软件需求问题。软件开发人员及用户往往容易忽略信息沟通，导致软件开发出来后，不能很好地满足用户的需要。而返工则不仅在技术上给开发人员带来巨大的麻烦，而且软件性能深受影响且造成人力、物力的浪费。所以在开发周期早期提高项目需求分析的质量，减少重复劳动，通过控制项目范围的扩展及需求变更来达到按计划完成预定目标是当前我国软件业急需解决的问题—这也是本书讨论的主要内容。

-book on software development as a crucial issue-software needs. Software developers and users often neglect communication of information, and to develop software, fail to satisfactorily meet the needs of users. And the redesign is not only to the technical development staff brought great trouble, but the software performance and its impact on manpower, material waste. So early in the development cycle analysis project needs to improve the quality, reduce duplication of work, By controlling the expansion of the scope of the project and needs to change to achieve the planned completion of the intended target is China's software industry in urgent need of a solution the problem - this is the book of the principal topics of discussion.