Since the development of relationships between the subjects of the international system (between states, between states and international organizations, between international organizations, etc.) is necessary and certain evaluation criteria (indicators) should be determined. Researchers, who examine the relations between various states, often describe the relations as "developing relations" if there are no acute(sharp) crises in the chronological framework.

However, in cases of serious crisis does not occur, such relationships can develop or weaken due to various factors. In this respect, it is imperative to determine indicators (evaluation indicators of international relations) to evaluate the periods of development and decline of relations with scientific methods between states, including participants (subjects) of the international relations system. For the first time, it has been tried to determine these indicators in the science of international relations and to apply them in the example of the relations between the Republic of Armenia and the Islamic Republic of Iran.