This journal article describes an evaluation of the Transition Age Youth-Vulnerability Index-Service Prioritization Decision Assistance Tool (TAY-VI-SPDAT): Next Step Tool (NST) for homeless youth. The authors looked at connections between NST vulnerability scores, housing placements, and the stability of housing outcomes for youth using data from the Homeless Management Information System (HMIS) collected between 2015 and 2017 from 16 communities. They analyzed to what extent communities use NST recommendations when placing youth into housing programs and whether scores effectively differentiate between permanent supportive housing (PSH) and rapid rehousing (RRH) interventions based on need. They found youth with higher vulnerability scores at intake had higher odds of continued homelessness without housing intervention. This suggests the tool successfully prioritizes which youth need housing services in the context of limited resources. Furthermore, they found most youth with low scores returned home or otherwise overcame their homelessness. Youth in PSH had low recorded returns to homelessness, regardless of their initial NST scores. Youth in RRH with vulnerability scores up to 10 also had low returns to homelessness, but success was more variable for higher-scoring youth. (author abstract modified)