Abstract
The cooling-off clause in international investment agreements, intended to foster amicable dispute resolution before arbitration, often causes varied tribunal interpretations and jurisdictional disputes due to its unclear drafting. This article aims to comprehensively explore the cooling-off clause, covering its definition, the beginning and ending points of the cooling-off period, function, and enforceability in investor-state dispute settlement practice. It also delves into two different approaches adopted by investment tribunals in case of non-compliance with the cooling-off clause. Drawing from this analysis, the article provides recommendations for Vietnam as a host state to ensure the effective application of this clause.