The issues of the present research are the source, necessity, definition and the quality of the creation of i'itibari necessity in Allameh Tabatabai's viewpoint in The process of performing the action. Conventional necessity plays a special role in actions so that all actions are performed according to it.
In Allameh Tabatabai's view, stopping the will on consciousness is self-evident and does not need a reason. In his view, the object of this consciousness cannot be a real necessary relation, but is an unnecessary and unrealistic relationship. Based on the unity and cognation of the relationship with its parties and quality. he argues that the parties and quality are i'itibari. In his view, this quality is the conventional necessity. The source of this necessity is the inner feelings come from the faculties of soul. In the light of these feelings, man gives the definition of real objects to other objects and makes the conventional necessity. It is the first conventional perceptions that man creates.