Homelessness and Vulnerably-Housed Defined: A Synthesis of the Literature.

There is no single accepted definition used in policy or research for the concepts of homelessness and vulnerably housed. Neuman's systems model (NSM) was the framework for this mixed-studies review, with the client system defined as these social issues and categorized as environmental stressors. Eighteen unique definitions of the concepts were identified in 30 studies. Extrapersonal stressors included housing history, interpersonal stressors included dependence on others for housing, and intrapersonal stressors included self-identification. Each level of stressor should be considered when defining these populations for inclusion in future research. Proposed definitions were formulated from the analysis of the results.