以下关于增量模型的叙述中，不正确的是（ ）。
- A.容易理解，管理成本低
- B.核心的产品往往首先开发，因此经历最充分的“测试”
- C.第一个可交付版本所需要的成本低，时间少
- D.即使一开始用户需求不清晰，对开发进度和质量也没有影响
正确答案及解析
正确答案
解析
增量模型又称为渐增模型，也称为有计划的产品改进模型，它从一组给定的需求开始，通过构造一系列可执行中间版本来实施开发活动。第一个版本纳入一部分需求，下一个版本纳入更多的需求，依此类推，直到系统完成。每个中间版本都要执行必需的过程、活动和任务。增量模型是瀑布模型和原型进化模型的综合，它对软件过程的考虑是：在整体上按照瀑布模型的流程实施项目开发，以方便对项目的管理；但在软件的实际创建中，则将软件系统按功能分解为许多增量构件，并以构件为单位逐个地创建与交付，直到全部增量构件创建完毕，并都被集成到系统之中交付用户使用。比较瀑布模型、原型进化模型，增量模型具有非常显著的优越性。但增量模型对软件设计有更高的技术要求，特别是对软件体系结构，要求它具有很好的开放性与稳定性，能够顺利地实现构件的集成。增量模型有以下不足之处：如果没有对用户的变更要求进行规划，那么产生的初始增量可能会造成后来增量的不稳定；如果需要不像早期思考的那样稳定和完整，那么一些增量就可能需要重新开发，重新发布；管理发生的成本、进度和配置的复杂性可能会超出组织的能力。一开始需求不清晰，会影响开发的进度，D选项错误。
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