When we consider the physician as a member of the population, as a consumer, as a man who., like every other, is driving a car, reading a paper, voting, all that has been said about interviews in general applies to him. There is of course some difficulty in approaching a physician, but the interview by itself raises no particular problem. The problem is not the same when we wish to interview the physician in his professional quality, as a medical equipment user, as a prescriber of pharmaceutical drugs. We then face a man having a control position. This does not apply especially to the physician.