A qualitative research method. Often it is a passive surveillance. At first, the interviewer visits the respondent at home, then go shopping together, in the stores most visited by the respondent, the respondent then returns home to continue the discussion and supervision. This development can be used at various retail outlets and includes accompaniment in such places as pubs, bars, clubs and sports centers. This method is used for delimiting aspects of behavior, which the respondent is not always ready to make them public.