The documentation plays a key role day by day in the communication offices of companies and institutions. Beyond it, when situations of crisis occur, the capacity of response of the organization depends of having to a great extensive a suitable planning and a documentary professional management. This piece of work revises the functions of the above mentioned documentation, expressed in the formats and the usual channels of diffusion of information both external spectators, across the mass media, and in the heart of the own entities whose image tries to look care. Over the years the influence of the press offices within the media has been increasing at the expense of the own informative production. The relative ease with which companies and institutions impose their speech through press releases and other resources threatens the exclusivity and quality of the sources in the result of journalistic work offered to citizens.