period and are used for many purposes. The Bureau agreed to reestimate the A.C.E. by the end of 2002 and announce a decision about possible adjustment of postcensal estimates shortly thereafter. We describe and evaluate that work, which produced the final Revision II A.C.E. estimates of the population, in Chapter 6.

The panel also commented in its third letter report on the revised demographic population estimates for 2000 (reprinted in National Research Council, 2001a:11):

We commend the Bureau for its work to examine each component of demographic analysis. However, its revised estimates of the immigration component are not independent of the census, and the estimates for births and immigration incorporate assumptions that are based primarily on expert judgment. Such judgments may be reasonable, but they retain sufficient uncertainty so that it is not appropriate to conclude that the revised demographic analysis estimates are more accurate than the census.

In Chapter 6, we comment on the role of demographic analysis and a revised A.C.E.-type coverage evaluation program for assessing coverage of the population in 2010.

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