Charter - I : Constitution of the international military tribunal - Art. 4.
(a) The presence of all four members of the Tribunal or the alternate for any absent member shall be necessary to constitute the quorum.
(b) The members of the Tribunal shall, before any trial begins, agree among themselves upon the selection from their number of a President, and the President shall hold office during that trial, or as may otherwise be agreed by a vote of not less than three members. The principle of rotation of presidency for successive trials is agreed. If, however, a session of the Tribunal takes place on the territory of one of the four Signatories, the representative of that Signatory on the Tribunal shall preside.
(c) Save as aforesaid the Tribunal shall take decisions by a majority vote and in case the votes are evenly divided, the vote of the President shall be decisive; provided always that convictions and sentences shall only be imposed by affirmative votes of at least three members of the Tribunal.