The provisional implementation of international treaties represents a relatively recent and increasingly significant development within the field of international treaty law. Over the past decades, this mechanism has assumed a critical role in promoting the flexibility and responsiveness of the international legal system. This study seeks to examine the various dimensions of provisional implementation by elucidating its legal framework within the context of treaties concluded by international organizations and analyzing the diverse forms through which it is applied. It further investigates the underlying reasons for the growing reliance on provisional implementation relative to other traditional and contemporary instruments in treaty law. In addition, the study explores the methodologies employed in the provisional application of treaties and underscores its practical significance in the operational functioning of international organizations. Notably, the topic has been included on the agenda of the International Law Commission since 2012, with four reports published on the subject as of February 2019.