尽管Beck没有说象配对编程，增量式计划之类的来源于XP，但是仍然有一些非常有趣的，我认为也是很重要的概念可以借用XP来表达。
Although Beck doesn't claim that practices such as pair programming and incremental planning originated with XP, there are some very interesting, and I think important, concepts articulated by XP.
就像顺序式模型，增量式模型先确定了项目范围并提前做好计划，因此它最适合需求明确而且不易发生变更的项目。
Like the sequential model, the incremental model is scoped and planned up front and therefore best suited to projects with very well defined requirements that are not subject to change.
就像顺序式模型，增量式模型先确定了项目范围并提前做好计划，因此它最适合需求明确而且不易发生变更的项目。
Like the sequential model, the incremental model is scoped and planned up front and therefore best suited to projects with very well defined requirements that are not subject to change.
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