Ethnographic study
In order to capture the context influence on the PN mode of operation a qualitative analysis was performed by an ethnographer. Participants were the five navigators, and people targeted by the Colonav PN intervention, met by the navigator during the survey (3 days spent in immersion with the PN). This survey was based on qualitative methods: Observations were ethnographic in nature. These observations consisted on the one hand of semi-directive interviews and on the other hand of on-site observations. The latter were participatory in the sense that the researcher is not external to the action but interacts with the actors involved. Local involvement of the researcher was preferred to exteriority of vision. The data from on-site observations were recorded, in the most exhaustive way possible, in a field journal by the researcher. The interviews were semi-structured, conducted on the basis of an interview guide which indicates a list of themes. Themes were approached in the natural order of the conversation, taking into account the contingencies of the interaction. Part of the interview was devoted to the interviewee's life story and useful socio-demographic and socio-economic descriptions. The interviews were recorded (with the express oral agreement of the interviewee) and transcribed in full.