This article focuses on the Dayton Agreement of 1995 that brought the war against Bosnia and Herzegovina (BiH) to an end, and served as a foundation to secure a stable environment within the country, providing a basis for its further stabilization and development. In the author's view, this Agreement represents quite a new strategic approach to solving international conflicts, with the partial delegation of the UN's legitimacy to regional arrangements, and the comprehensive addressing of political, legal, social, military, economic, and other aspects of social life. The author also believes that today, 20 years after the end of the war, BiH is still a sort of geopolitical laboratory with a comprehensive approach strategy in place, and with enough space to judge as to its results and overall effectiveness. The article argues that the comprehensive approach reified in the Dayton Agreement's implementation strategy has, in the case of BiH, resulted in a synergetic effect of its all parts, thus providing a solid basis on which to build the concept of a Model of Synergy as a theoretical contribution to the discipline of international relations. Through analyzing the engagement of three of the Dayton Agreement's key implementing bodies – namely NATO, the EU and the OSCE – the author demonstrates that the manner of their participation in the conflict resolution and conflict management process was through establishing their mutual synergetic cooperation.