Levy-Vroelant 2010:449
The impossibility of having a general and operational definition of vulnerable groups is due to the link with the concept of risk which, by definition, proceeds by estimation and is largely dependent on context. The lack of efficiency in classifica- tion, no matter howsophisticated it might be, also results from the placing of persons and groups into competition for access to rare housing resources. The more that the definition of vulnerable populations is linked to the concept of risk, the more it is encompassing. The FEANTSA categories (ETHOS), for instance, cover all situa- tions concerning bad housing, lack of housing and the insecurity of housing status. As a result of the concept of specified social risk, which defines a large number of groups that are vulnerable because the people are at risk (children, isolated individ- uals, single-parent households, immigrants, the disabled, the elderly, etc.), housing policy priorities tend to dilute and enlarge poverty by considering the difficult living conditions of people rather than just their financial insecurity