A group exists when two or more people define themselves as members of it and when its existence is recognized by at least one other. (Rupert Brown 1988). The group is a collection of individuals who accept the common task and their interdependence in their performance to promote its achievement through mutual interaction. On the other hand, group behavior originates from motives that contribute to the efficiency of the group. Other groups interconnect with group functions, expand their unique set of uniqueness, and also develop a group structure in which they have cohesion, role, norms, and process. A group can participate with other groups when groups work together and competition between groups is also the cause of conflict. Group behavior was studied extensively in the mid-20th century (Alford, 1994; Brown, 2001; Hogg, 2000). Describing the development of the group we discovered that group dynamics consist of a set of techniques linked to the internal nature of the group. Meaningful goals and event development early in the group's life are very helpful. The group size should be between 5 and 7 members which are the best elements of both small and large groups. The stages of group development are Forming, Storming, Norming and Performing. Training is the first phase in which we try to build the group, which is characterized by a lot of improbability. The initial goal is often just to gain awareness, new group members are usually polite, friendly and reserved. Group members naturally retain their true personal emotion. Group members are trying to decide what behavior is suitable during group activities. On the other hand, there is great ambiguity regarding the purpose of the group, s...... middle of paper ......ile avoiding insurmountable disagreements. Group behavior is most successful when it has clear and strong norms that regulate behavior and ensure that coordination is implemented. It is very important that these courses encourage group members to act proactively and learn from their experiences. Reference Brown, Rupert (1999) Group processes: dynamics within and between groups 2e. Oxford: WileyBlackwell.Johnson, David W. and Frank P. Johnson (2003) Joining Together. Group theory and group skills 8e. Boston: Allyn and Bacon.Alford, C.F. (1994) Group processes and political theory. Yale University Press, New Haven.Brown, R. (2001) Group Processes: Dynamics with and Between Groups. 2nd edition. Blackwell Publishing, London.Hogg, M. (2000) Blackwell Handbook of Social Psychology: Group Processes. Blackwell Publishing, London.