Identifying Families. Identifying Families Robert M. Goerge, and Emily R. Wiegand rsf 2019;5:86-104 © 2019 Russell Sage Foundation. Goerge, Robert M., and Emily R. Wiegand. 2019. “Understanding Vulnerable Families in Multiple Service Systems.” RSF: The Russell Sage Foundation Journal of the Social Sciences 5(2): 86–104. DOI: 10.7758/RSF.2019.5.2.05. We gratefully acknowledge Cheryl Smithgall, Roopa Seshadri, and Peter Ballard for assistance with the data preparation and analyses described in this article. We also thank our agency partners at the Illinois Department of Human Services, Illinois Department of Child and Family Services, Illinois Department of Healthcare and Family Services, Illinois Department of Juvenile Justice, and Illinois Department of Corrections for their collaboration and support, which made this study possible. Direct correspondence to: Robert M. Goerge at rgoerge@chapinhall.org, 1313 E. 60th St., Chicago, IL 60637; and Emily R. Wiegand at ewiegand@chapinhall.org, 1313 E. 60th St., Chicago, IL 60637.