مؤلف: Beth-Ellen Pennell

JANET A. HARKNESS, Ph D, is Director and Graduate Chair of the Survey Research and Methodology Program and Gallup Research Center at the University of Nebraska-Lincoln. MICHAEL BRAUN, Ph D, is Senior Consultant at GESIS – Leibniz Institute for the Social Sciences (Germany). BRAD EDWARDS is Vice President and Associate Director at Westat, Inc. TIMOTHY P. JOHNSON, Ph D, is Professor and Director of the Survey Research Laboratory at the University of Illinois at Chicago. LARS LYBERG, Ph D, is Chief Scientist at Statistics Sweden. PETER PH. MOHLER, Ph D, is Professor at University of Mannheim (Germany). BETH-ELLEN PENNELL, Ph D, is Director of Survey Research Operations at the Institute for Social Research at the University of Michigan. TOM W. SMITH is Director of the General Social Survey at the National Opinion Research Center at the University of Chicago.