Waiver, acquiescence, and extinctive prescription are legal concepts entailing the same effect—they lead to the loss of a right or claim. In the context of State responsibility, they entail the loss of the right to invoke responsibility, ie they extinguish any existing claim for cessation, reparation, or guarantees and assurances of non-repetition. The rules governing these concepts come within the framework of the implementation of international responsibility as dealt with in Part Three of the International Law Commission’s Articles on Responsibility of States...