Evaluations of the Accuracy and Coverage Evaluation (A.C.E.) of the U. S. Census 2000 uncovered several problems leading the Census Bureau to decide to use unadjusted population counts instead of ones incorporating the A.C.E. results. This talk reviews the evaluation results, the design problems encountered, and our plans to produce revised estimates of Census 2000 coverage for purposes of potentially adjusting post-censal population estimates. This work on revising the A.C.E. estimates will lead to a coverage research agenda for the 2010 census. The talk will also address issues raised in the Supreme Court Case dealing with Census imputations.