The discovery of small groups has considerable resonance in both the practical and technical and the social study. His purpose in life companies, educational institutions, from hospitals and scientific equipment and técnicosse quickly revealed to the eyes of all who practice and share production responsibilities, education and search. Later he felt the need to make an instrument pequeñp group therapy, rehabilitation, rehabilitation and training. From this we can deduce the interest of clear information on group dynamics, information that is known to us here with an American work of base. By giving access to an essential, albeit limited, social psychology today, this type of initiation is necessary for the realization of numerous professional and social tasks.