In the field of comunication sciences, Public Relations constitute a very complex set of activities that are institutionalized under this denomination. So, I am speaking of the communciative conception of them. My feeling is that the theoretical research on it is, unfortunately, limited, and often with a dominant pragmatic and professional approach. We have to accept that practically speaking they are very important, but the degree of knowledge of the researchers on communication sciences and of the citizens is rather limited. Often they are assimilated or confused with the advertising, when, in fact, in this communicative field, they are nearer to...