Obviously, you are studying 'control' from geopolitical point of view. If it is, than you may, first, define the forms of control: political, economic (trade, access to strategic row materials, access to markets, joint ventures), financial (use of currency, curency reserves, debt, investments), military, demographic, informational (news agencies, Internet providers, control on social media), cultural (TV production and emissions, movies, books, education, research, free of charge training and education, use of language,etc). Second, you may determine indicators in each of them. Note, GDP and military power are instruments of national power, but you have to consider them only if are used to establish control (for ex. German army is big, but not used recently to establish control). And one more, in geopolitics control is over 'space', not exactly 'country'. And third note, usually powers use different forms of control depending on the intensity of their interests.

Best

Thank you so much for help me, I think I get on a lot of information and to complete my research about international system, the culture force has many of indicators can be as data such as movies, books, language ...... etc

thank you, I just want to study the culture as parameters for the great powers in the world. what do you think? or I can study other indicators as military expenditure, GDP,

thank you

Dear Abdallah

Cultural indicators are tools that serve as reference for the understanding of phenomena that occur in the sphere of culture , allowing the concrete recognition and objective description of certain aspects of cultural experience , thus contributing to the expansion of knowledge about the topic .

An indicator is not a pure statistical but rather processed for the purpose of providing specific information

The indicators are not neutral ; depend on the context in which they are constructed and the purposes they serve

To be prepared , indicators need from a conceptualization of the phenomenon you want to quantify

In the case of the cultural sector , a particular challenge is there is no single understanding of what culture is , and there is no global models that can sustain a standardized system of cultural indicators .

Every system of cultural indicators is flawed because there is no way to express in statistics all experiences , practices , influences and impacts of culture