Power Approach Theory: the maximum number of people adopted this theory for the maximum period. Morgenthau and Spykman were the chief supporters of this theory. This theory tries to understand international politics in terms of state interest. Under this approach it is assumed that the interest guides the statesmen more than any other factor. They may talk in terms of philosophy and ideologies but in actual actions, they only act in terms of national interests.

The power approach theory has been the most popular and acceptable. It is criticized because it attaches too much importance to political power. Man is not merely a political animal interested in controlling the action of others. Other factors also determine his action. The supporters of this theory consider the power as an end and fail to realize that it is only a mean. To define national interest in terms of power is also incorrect.

Conclusion: "A study of the various approaches and theories of international relations shows that study of international relations has become increasingly interdisciplinary, behavioral, comparative and scientific. This obviously has been to place the study within a border and more meaningful theoretical framework. And to give it more adequate methodological and conceptual tools."