The first hypotheses and analysis on the collective phenomenina, its structures and transformations we found, them in ” ” Repblica” ” of Plato and in ” ” Poltica” ” of Aristotle. The study of the groups and the human relations, has acquired a positive and experimentalista character at beginning of century XX. It has to recognize that the psychology and the sociology of the groups have been impelled by the great European precursors of human sciences. Between these they are possible to be mentioned: Emilio Durkheim, initiator of ” ” Social” dynamics; ” that it contributed to interpretations of the collective processes in all the scales; Freud, creator of the psychoanalysis that revolutionizes the society with their expositions about the neurosis and the psycotherapy. Later, Kurt-Lewin believes in 1944 the term ” ” Dynamics of Grupo” ” and it promotes the investigation current that it takes its name (LEWINIANA).

Between the main currents of investigation of this area of Social Psychology, we can mention the following: First from them he takes consideration as much the people as to the psychological atmosphere. The group this call to solve its tensions and conflicts and to establish a more or less stable balance. The group phenomena and processes are object of theoretical analysis – practitioner. Second current (INTERACCIONISTA), one is based on the systematic observation of the immediate data of the processes that interact between individuals. His maximum representative is YOU BLEAT ROBERT. The current Psychoanalyst characterized by the decisive influence of the concepts and models of Sigmond Freud. The main representatives of this current are: Bin, Balint and Jacques. The humanistic current conceives to the human being like a whole (holistic), and in constant interaction with its atmosphere.