第1阶段(向后兼容性评估)将在下一部分中进行讨论。
The backward compatibility assessment, stage 1, is examined in the next section.
XP 的一个好处是评估的精确性，从项目范围阶段高层次的含糊花费开始，将在版本计划和迭代计划阶段得以进一步细化。
One benefit of XP is the refinement of estimates, beginning with high-level vague costs at the project scope phase, which are further refined during the release planning and iteration planning stages.
检查的一个重要方面是为每个主动性工作设定多个决定点，这样管理人员可以阶段性的评估数据是否继续进行该工作。
A significant aspect of oversight is setting multiple decision points for each initiative, so that managers can periodically evaluate data and decide whether to continue the work.
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