James M. Lepkowski, PhD, is Professor of Biostatistics and Research Professor at the Institute for Social Research at the University of Michigan. CLYDE TUCKER, PhD, is Senior Survey Methodologist at the U.S. Bureau of Labor Statistics in Washington, D.C. J. MICHAEL BRICK, PhD, is Director of the Survey Methods Unit at Westat, Inc., in Rockville, Maryland. EDITH D. de LEEUW, PhD, is Associate Professor in the Department of Methodology and Statistics at Utrecht University in the Netherlands. LILLI JAPEC, PhD, is Senior Statistician at Statistics Sweden. PAUL J. LAVRAKAS, PhD, is Vice President and Senior Research Methodologist at Nielsen Media Research in New York, New York. MICHAEL W. LINK, PhD, is Senior Survey Methodologist at the Centers for Disease Control and Prevention in Atlanta, Georgia. ROBERTA L. SANGSTER, PhD, is Research Statistician at the U.S. Bureau of Labor Statistics in Washington, D.C.