但是不同的形式都有同样的基本原理，比如迭代的方法和尽早缓解风险。

However, they all share the same fundamental principles, such as an iterative approach and early risk mitigation.

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较早的迭代测试初始且较基本的产品功能。

Earlier iterations tested initial and more basic product functionality.

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阶段由若干迭代组成——依照基本计划和评价标准的不同序列的活动会致使工件的发布(内部或外部的)。

Phases consist of multiple iterations — distinct sequences of activities with a base-lined plan and valuation criteria resulting in a release of artifacts (internal or external).

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