Before one proceeds from the assumption that international custom is a recognised source of international law one should pause to determine whether this expression still has the meaning commonly accepted by most jurists at the time they were students – and never questioned thereafter. We are sometimes warned that customary norms in the international sphere are not anymore what they used to be, and that the formation of customary law has undergone important changes. [...] segue https://www.ispionline.it/it/documents/wp_7_2006.pdf