The effectiveness of international environmental regimes is a subject that is becoming more and more important within the International Relations discipline. While one of the reasons of that is the increasing interest of the international community in environmental issues, the other reason is that the environmental issues have turned into a problem that has a direct impact on the relations among the states. However, there is no consensus on approaches about the assessment of the effectiveness of the environmental regimes. This study aims to consider the different approaches and views that are important in terms of the assessment of the effectiveness of environmental regimes. In this framework, the approaches related to regime effectiveness are assessed, and the outlines of theoretical and methodological framework that can be used in the analysis of regime effectiveness are tried to be defined.