We point out that the communication has some basic functions in an institution of social assistance. This process is importantssimo, a time that the orientation transmitted for the social assistant acts in the control of the behavior of the users, facilitating the motivation in justice search and at the same time it provokes interaction enters the using individuals of the services (family or specific group), a time that the communication supplies to the way the emotional expression of feelings and attendance them social necessities of each individual. All this process of communication when adjusted to the environment of work of the social assistant, it brings to the souvenir of this exchange the importance of the good communication. The clean, clear and objective communication when if to deal with the exchange of information with users of informacional, cultural and emotional low income, who are kept out of society and citizens the social exclusion. In this exchange and allotment of information, the social assistant and the user are at the same time emitting and receiving of the message, a time that this transmission is cyclical and permanent inside of a dialogue. Without this, it does not have communication. Diverse interpersonal and intrapessoais barriers exist that can intervene and hinder a good performance of the efficient communication, where the message sent for the sender (the social or using assistant) can well not be understood by the receiver. They are: the filtering (she relates it manipulation of information for sender, so that it is seen in more favorable way for the receiver, in the choice certain them words to be employed), selective perception (where the receiver in the communication process sees and listening selectively on the basis of its proper necessities, experiences and motivations), overload of information (when information with that we have that to deal exceed our capacity of processing), defense (when the person if feels threatened if she sees in the necessity of if abiding the small parts of the speech replying with verbal attacks, precipitated sarcasm and judgments how much the message received for sender), the diverse types of language (where the age, the education and the cultural description influence the form as it decodes the message) and fear of communication (for shyness or unreliability).