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ensure accuracy. Once, Only Once, and in the Right Place:
Residence Rules in the Decennial Census areas. When that
production begins, however, the Census Bureau will be in the
position of having two related flagship products—the decennial
census and the ACS—follow two very discrepant residence models.
How this discrepancy will affect estimates of population
characteristics, and the extent of the gap that may arise
between ACS and census estimates in decennial census years, is
unknown. However, the coexistence of the census and the ACS
makes the choice of residence standard as an open and important
issue; we discuss the ACS and the census residence standards in
detail in Chapter 8. Both the de jure and de facto ideals have
strengths and weaknesses. One is not clearly superior to the
other; rather, the choice between which standard