“…Building on the foundation of past research, current studies have proceeded to investigate factors that influence the mental and physical health of the homeless (La Gory, Fitzpatrick, & Ritchey, 2001) and on special populations among the homeless, such as adolescents (Bao, Whitbeck, & Hoyt, 2000;Dachner & Tarasuk, 2002;Johnson, Whitbeck, & Hoyt, 2005), those with substance abuse problems (Valdez, Neaigus, & Kaplan, 2008;Zlotnick, Tam, & Robertson, 2003), or those that engage in risky sexual behavior Tucker et al, 2009;Tyler, 2007). Other recent studies of the homeless have combined the positive features of both quantitative and qualitative methods (Dordick, 2002;Molina, 2000;Morrell-Bellai, Goering, & Boydell, 2000) and an applied longitudinal research design to explore factors that facilitate exiting homelessness (MacKnee & Mervyn, 2002;Patterson & Tweed, 2009;Toohey, Shinn, & Weitzman, 2004).…”