Debra Rog and John Buckner report that since the mid-1990s, there has been continued research and policy interest in understanding the characteristics and needs of families and children who become homeless, especially in understanding the heterogeneity within the population and whether a "typology" of families can be created (i.e., distinguishing families with greater needs for services and housing from those with lesser needs.) The authors review the findings from recent studies on homeless families and children and summarize the descriptive and outcome findings from evaluations of housing and service interventions and prevention efforts. With respect to children, research has focused on understanding and documenting the impact of homelessness on children. Rog and Buckner emphasize that that many of the challenges homeless families and children confront are also experienced by families that are very poor but not homeless, pointing to the need for further research on how to target assistance most efficiently to minimize the incidence and duration of homelessness for low-income families and children in general.