The Permanent Housing component of the Supportive Housing Program, the Department's principal program to meet the needs of homeless people with disabilities, was established to offer homeless people with disabilities, including mental illness, an assurance of permanent housing and appropriate supportive services. The program is designed to provide a structure that counteracts the disruptions of both homelessness and disability. However, while many formerly homeless people remain in permanent supportive housing for many years, substantial numbers leave within months of entry. The questions of why people leave permanent housing and what happens to them constitute the principal focus of this study.