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-systemestimation and so on.
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.