Youth Homelessness NOFO provides competitive awards to eligible applicants under two different programs-Youth Homelessness System Improvement (YHSI) grants- Assistance Listing Number (ALN) 14.277Youth Homelessness Demonstration Program (YHDP)- ALN 14.276Under the YHSI grants, HUD will make awards to selected communities to support them in establishing and implementing a response system for youth homelessness or for improving their existing response system.