Introduction: New Challenges to Social Measurement - Douglas S. Massey and Roger Tourangeau Facing the Nonresponse Challenge - Frauke Kreuter Explaining Rising Nonresponse Rates in Cross-Sectional Surveys - J. Michael Brick and Douglas Williams Response Rates in National Panel Surveys - Robert F. Schoeni, Frank Stafford, Katherine A. McGonagle, and Patricia Andreski Consequences of Survey Nonresponse - Andy Peytchev The Use and Effects of Incentives in Surveys - Eleanor Singer and Cong Ye Paradata for Nonresponse Adjustment - Kristen Olson Can Administrative Records Be Used to Reduce Nonresponse Bias? - John L. Czajka An Assessment of the Multi-level Integrated Database Approach - Tom W. Smith and Jibum Kim Where Do We Go From Here? Nonresponse and Social Measurement - Douglas S. Massey and Roger Tourangeau