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The article is an attempt to look at very essential issue within public international law, that is its methodology. Due to the fact, this branch of law possesses a vital impact on the peace and security in the world, it appears highly important to thoroughly examine the forms of its analysis. Nonetheless, even the scientists of international law themselves, they are unable to clearly define the assumptions or cognitive methods. It is worth mentioning that respected authors of publications concerning international law, who deal with the process of analysis of the law, do avoid the answer on the following question: “What is the methodology in public international law?”. Some sort of the scientific tip seems to be the old schools, created over the centuries. However, their specific criteria became eventually out of date. According to the raison d’état of particular state, the economic ties started to come to the fore. That is why private international law has introduced civil law into the branch of international law. Hence, one has to make use of the research methods available in the cognitive discipline, such as political science, or other social sciences. Reinforcement of the methodological knowledge might in fact lead to the better quality of analysis of public international law.