This article summarizes the accuracy and coverage evaluation survey (A. C. E. survey) of the American census 2000. It includes sampling design, post-stratification, dual-system estimation and so on.

本文概要地叙述了美国2000年人口普查后所进行的准确性和数字评估调查（A.C.E。调查）。它包括：抽样设计、事后分层、双系统估计等等。

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In other words, your estimation should be based on transactions being "round trips," not system steps.

换句话说，您的估算应该基于“环形的”事务，而不是系统步骤。

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Furthermore, because of software's inherent flexibility, we can build a system in almost any way we like, using whatever means we like, further exacerbating the problems of accurate estimation.

此外，由于软件自身固有的灵活性，我们能够随心所欲的建造系统，这就进一步增加了精确评估问题的困难程度。

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