ROBERT M. GROVES is Research Professor and Director at the University of Michigan Survey Research Center, Professor of Sociology at the University of Michigan, and a Research Professor at the Joint Program in Survey Methodology at the University of Maryland.

FLOYD J. FOWLER, JR., is President of the Foundation for Informed Medical Decision-Making and a Senior Research Fellow at the Center for Survey Research, University of Massachusetts, Boston.

MICK P. COUPER is a Research Associate Professor at the University of Michigan Survey Research Center and at the Joint Program in Survey Methodology at the University of Maryland.

JAMES M. LEPKOWSKI is Research Professor at the University of Michigan Survey Research Center, Associate Professor of Biostatistics, Director of the Graduate Program in Survey Methodology, University of Michigan, and a Research Professor at the Joint Program in Survey Methodology at the University of Maryland.

ELEANOR SINGER is a Research Professor at the University of Michigan Survey Resea rch Center, and an Adjunct Professor of Sociology at the University of Michigan.

ROGER TOURANGEAU is Research Professor at the University of Michigan Survey Research Center and Director of the Joint Program in Survey Methodology at the University of Maryland.