Charter - I : Constitution of the international military tribunal - Art. 2.
Art. 2. The Tribunal shall consist of four members, each with an alternate. One member and one alternate shall be appointed by each of the Signatories. The alternates shall, so far as they are able, be present at all sessions of the Tribunal. In case of illness of any member of the Tribunal or his incapacity for some other reason to fulfil his functions, his alternate shall take his place.