The new edition highlights changes in the Census Bureau's data collection and dissemination practices for the 2010 enumeration, including the use of a short-form questionnaire for the actual population count, and the release in late 2010 of the American Community Survey (ACS) 5-year data set based on rolling samples of the U.S. population and gathered using the long-form questionnaire. The second edition also comprehensively covers the fallout from the 2000 census and recent issues affecting the administration of the 2010 count.