Abstract
Generally, power is a potential effect. In other words, power is the potential to influence others. If a distinction between formal power and informal power is made, it can be claimed that formal power is the potential to influence others due to the position of the person while informal power is the capacity to influence others regardless of the position of the person. When the literature is examined, it is seen that there are many definitions about the power and the classification of power sources. The most used power classification is French and Raven's taxonomy which can be defined as quintet classification. According to this taxonomy, power sources are reward power, coercive power, expert power, referent power and legitimate power. However, the classification of power sources in terms of formal-informal has not been encountered in the literature. In thr study, it is aimed to make a compilation for the conceptual framework of power phenomenon with its formal and informal aspects. As a result of the study, it is seen that the power issue is discussed in general and the evaluations made in the context of the formal power informal power are insufficient. In addition, it is concluded that the informal power, which may be an important tool in the management of institutions, should not be ignored by the managers.