Abstract
Individual behavior is dependent upon whether a person is in a group or not. Individuals act differently in accordance with their situation. A group is composed of a minimum of two people. There are Two types of groups that have been identified by Stephen P. Robbin (1996) - a formal and an informal group. The formal one is one in which the people's behavior is identified by the organization through assignments for example and the informal one has nothing at all to do with the organization and is not structured. The leadership concept has become increasingly important over the years for an organization . Consequently, psychology's basis requires some update in order to identify more effectively the transformations within an organization - especially the ones affected by globalization. This is why when it comes to human conflicts leadership is regularly questioned. Obviously those questions are not new. However the context makes them more relevant.
