Garfinkelian ethnomethodology is part of useful theoretical frames for research on information-communication in the field of health problems. The case of an empiric research on subjective obstacle to participating as a subject in clinical trials is set out. It illustrates the way key concepts of ethnomethodology could help to break the deadlock of badly put questions--and to make visible unnoticed everyday routines of vital importance. It is suggested that ethnomethodology could provide the basis--theoretical and practical--of a "reflexive problemology"
