1. R. J. Sampson is in the Department of Sociology, University of Chicago, Chicago, IL, 60637 and is a Research Fellow of the American Bar Foundation, Chicago, IL 60611, USA. S. W. Raudenbush is at the College of Education, Michigan State University, East Lansing, MI 48824, USA. F. Earls is the Principal Investigator of the Project on Human Development in Chicago Neighborhoods and is at the School of Public Health, Harvard University, Boston, MA 02115, USA.