The decennial census is the nation's most comprehensive and expensive data-gathering program. On Sept. 27, 2000, the U.S. Census Bureau reported to the congress that it had at least $305 million of budget savings out of its $4.5 billion fiscal year 2000 one-year appropriation for the 2000 decennial census. This report reviews the accuracy of this reported amount and identifies budget variances for the 2000 decennial census, including the reasons for these variances. The report also reviews key internal controls of the U.S. Census Bureau and reports on any significant weaknesses and how they might be corrected. The Appendix contains details on the report's scope and methodology. Tables.