Homeless people with mental illness are one of the most vulnerable groups in urban areas but often do not get the assistance needed to end homelessness and to address health and psychosocial needs. Using key concepts of Pierre Bourdieu, the author provides a detailed analysis of the help system for the homeless mentally ill in Berlin. Qualitative interviews with 25 stakeholders of this help system were conducted and analyzed. The author reveals that this fragmented help system frequently fails to address the most vulnerable homeless who suffer from both psychiatric disabilities and substance abuse problems. A possible solution to this challenge is presented: the Housing First approach that was developed in New York. Using this relatively recent innovation, ideas are illustrated which have been proven to be effective in promoting social inclusion of the homeless mentally ill. This book provides a foundation for informed discussion and further research about how to counteract social exclusion of this hard to reach' population, and should be especially useful to social and health professionals, policy makers and researchers committed to supporting this group more successfully.