For the Census of 2000, the short form consisted of only seven questions, while the long form consisted of 52 questions and was used for a 17-percent sample of the population. For the first time, race questions were not limited to a single category; rather, respondents were able to check multiple boxes. A new question related to grandparents as caregivers was also mandated by legislation passed in 1996. Disability questions were expanded to including hearing and vision impairments, as well as learning, memory, and concentration disabilities. The 2000 Census also eliminated questions related to children born, water sources, sewage disposal, and condominium status. In addition, the 2000 Census was the first in which the Internet was used as the principal medium for the dissemination of census information. Summary Files were available for download immediately upon release and individual tables could be viewed via American FactFinder, the Census Bureau's online database. Files were also available for purchase on CD-Rom and DVD.

Due to declining questionnaire mail-back rates, the U.S. Census Bureau marketed a $167 million national and local print, television, and public advertising campaign in 17 different languages. The campaign successfully brought the mail-back rate up to 67 percent. Additionally, respondents receiving the short form were given the option of responding via the Internet. Telephone questionnaire assistance centers available in six languages also took responses via the phone. Statistical sampling techniques were utilized in two ways: first, to alter the traditional 100-percent personal visit of non-responding households during the non-response follow-up (NRFU) process instead by following up on a smaller sample basis; second, the sampling of 750,000 housing units matched to housing unit questionnaires obtained from mail and telephone responses, as well as from personal visits. The goal of the latter was to develop adjustment factors for individuals estimated to have been missed or duplicated and to correct the census counts to produce one set of numbers. This "one-number census" would correct for net coverage errors called Integrated Coverage Measurement (ICM). Both of these measures were taken in an attempt to avoid repetition of the litigation costs generated by the 1980 Census and the 1990 Census.

Despite these efforts, two lawsuits—one filed by the U.S. House of Representatives—were filed in February 1998 challenging the constitutionality and legality of the planned uses of sampling to produce apportionment counts. Both cases were decided in favor of the plaintiffs in federal district courts, but the U.S. Department of Commerce made appeals to the U.S. Supreme Court. Known as the  U.S. Department of Commerce v. the U.S. House of Representatives, the Court ruled that the Census Bureau's plans to use statistical sampling for purposes of congressional apportionments violated the Census Act. The bureau revised its plan, stating that it would produce statistically adjusted data for non-apportionment uses of census data information, such as redistricting. However, in March of 2001, the Census Bureau recommended against the use of adjusted census data for redistricting due to accuracy concerns; the Secretary of Commerce determined that the unadjusted data would be released as the bureau's official redistricting data. The Director of the Census Bureau also rejected to the use of adjusted data for non-redistricting purposes in October of that same year.]]>
U.S. Census Bureau]]> U.S. Census Bureau, 2000.]]> U.S. Department of Commerce]]> U.S. Census Bureau, 2000.]]> U.S. Census Collection, RICHES of Central Florida.]]> U.S. Census Bureau and published by the U.S. Department of Commerce.]]>
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    For the 1990 Census, the U.S. Census Bureau utilized extensive user consultation prior to enumeration in order to refine both long and short form census questionnaires. The short form consisted of 13 questions and was given to the entire population. The long form asked 45 questions and was given to a 20-percent sample. The long form included topics related to marital history, carpooling, residence, residential elevators, and energy usage. Unlike the 1980 Census, the new census eliminated questions regarding air conditioning, the number of bathrooms in a residence, and the type of heating equipment used. A vast advertising campaign was marketed to increase public awareness of the census via public television, radio, and print media. Like the previous census, the Census of 1990 made a special effort to enumerate groups that have historically been undercounted in previous censuses called "S-Night": individuals in homeless shelters, soup kitchens, bus and railway stations, and dormitories (enumerated separately in the 1980 Census on "M-Night"); and permanent residents in hotels and motels (enumerated separately in the 1980 Census on "T-Night"). Following legal issues filed in response to the 1980 Census regarding statistical readjustment of undercounted areas, the Census Bureau initiated a post-enumeration survey (PES), in which a contemporaneous survey of households would be conducted and compared to the census results from the official census. In a partial resolution of a 1989 lawsuit filed by New York plaintiffs, the U.S. Department of Commerce agreed to use the PES to produce population data that had been adjusted for the projected undercount and that said data would be judged against the unadjusted data by the Secretary of Commerce's Special Advisory Panel (SAP).

    The Census of 1990 also introduced the U.S. to the Topologically Integrated Geographic Encoding and Referencing System (TIGER), which was developed by the U.S. Geological Survey and the Census Bureau. TIGER used computerized representations of various map features to geographically code addresses into appropriate census geographic areas. It also produced different maps required for census data collection and tabulation. Five years earlier, the Census Bureau became the first government agency to publish information on CD-ROM. For the 1990 Census, the bureau made detailed census data, which had previously been only available to organizations with large mainframe computers, accessible to any individual with a personal computer. Census data was also available in print, on computer tape, and on microfiche. Using two online service vendors, DIALOG and CompuServe, the Census Bureau also published select census data online.

    As with previous censuses, the 1990 Census undercounted the national population, and again, the African-American population had an estimated net undercount rate that was significantly higher than the rate for other races. In July of 1991, the Secretary of Commerce announced that he did not find evidence in favor of using adjusted counts compelling—despite SAP's split vote on the issue—and chose to use unadjusted totals for the official census results. In response, the New York plaintiffs resumed the lawsuit against the U.S. Department of Commerce. A federal district court ruleded in favor of the DOC in April of 1993. The U.S. Court of Appeals, however, rejected the previous court ruling and ordered that the case be reheard by the federal district court. In March of 1996, the U.S. Supreme Court finally ruled in favor of the Secretary of Commerce's decision to use the unadjusted census date, but did not rule on the legality or constitutionality of the use of statistical adjustment in producing apportionment counts.]]>
    U.S. Census Bureau]]> U.S. Census Bureau, 1990.]]> U.S. Department of Commerce]]> U.S. Census Bureau, 1990.]]> U.S. Census Collection, RICHES of Central Florida.]]> U.S. Census Bureau and published by the U.S. Department of Commerce.]]>
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    Due to the success of the 1970 Census' mail-out/mail-back questionnaire, the program was expanded for the Census of 1980 to include approximately 95 percent of the population. The short-form questionnaire for this census contained seven questions related to population and 11 questions related to housing; whereas the long-form questionnaire included 26 questions on population and 10 questions on housing. A question regarding Spanish or Hispanic origin, separate from race inquires, was used in all questionnaires due to its success in a five-percent sample for the 1970 Census. Two surveys were included in the new census: the Components of Inventory Change Survey, making inquiries regarding the number and characteristics of housing units that either changed or remained the same between 1973 and 1980; and the Residential Finance Survey, which collected information on mortgages, shelter costs, housing characteristics, and owner characteristics. The U.S. Census Bureau's Census Publicity Office, established in 1978, directed an extensive public service advertising campaign focusing on public awareness of the census and encouraging individuals to participate. A special effort was made to enumerate groups that have historically been undercounted in previous censuses: "M-Night" focused on counting individuals in homeless shelters, soup kitchens, bus and railway stations, and dormitories; "T-Night" focused on the enumeration of hotels and motels with permanent residents.

    The State Data Center Program was established to simplify public access to census data via computer tapes. The Census Bureau was to provide free copies of electronic and printed census information and products to each state; in return, the state agreed to develop a network of affiliated organizations, such as state executive departments, chambers of commerce, councils of government, university research departments, and libraries, by which census information would be housed for public access. All states had joined the program by the middle of the decade.

    Despite various technological and procedural advances, the U.S. Census undercounted the national population, as it typically did in previous censuses. The African-American population had an estimated net undercount rate that was 3.7 percentage points higher than the rate for all other races combined. Various cities and states, beginning with the City of Detroit, filed suit against the U.S. Census Bureau, demanding that statistical adjustment be used to compensate for census estimates that had been omitted or improperly counted. In the Fall of 1980, the Bureau announced that it would not adjust its population totals because it was unable to determine the number and distribution of illegal aliens and other undercounted groups. A federal district court ruled in favor of the City of New York and the State of New York that same year, ordering the Census Bureau to correct its numbers. The U.S. Supreme Court stayed this ruling, as well as other similar rulings, in December of 1980, which allowed the Bureau to report its figures to the President unadjusted. In 1987, a federal appeals court ruled that the census figures should not be adjusted because the Census Bureau's decision not to adjust the figures was not arbitrary nor capricious.]]>
    U.S. Census Bureau]]> U.S. Census Bureau, 1980.]]> U.S. Department of Commerce]]> U.S. Census Bureau, 1980.]]> U.S. Census Collection, RICHES of Central Florida.]]> U.S. Census Bureau and published by the U.S. Department of Commerce.]]>
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