The research and recommendations are the responsibility of the authors of the report and do not necessarily reflect the views of the Housing and Homelessness Branch. [...] The literature review also addresses issues such as the definition of concurrent disorders, the prevalence of concurrent disorders, characteristics of individuals with concurrent disorders, and the connection between concurrent disorders and homelessness. [...] The purpose of the interviews was to hear from the residents and individuals using the services what they like most and least about their housing, the kind of services and activities they are involved in, what their life was like before they became involved in the program, how their life changed since becoming involved in the program, and suggestions for other organizations interested in undertaki [...] The difficulty in assessment, the overlap in substance abuse and mental disorders, and the complexity of understanding the causal links is an issue that resurfaces in the literature (Farrell et al. [...] A study in Montreal of the trajectories of homeless persons who were substance users and in the process of stabilisation found also that housing was the cornerstone for stabilisation and that the ability to maintain the housing was the result of a more global process of rehabilitation (Mercier et al.