the sixth session of General Agreement on Tariffs and Trade (GATT) trade negotiations held in 1964-1967 in Geneva, Switzerland. Congressional passage of the US Trade Expansion Act in 1962 authorized the White House to conduct mutual tariff negotiations ultimately leading to this. It had four major goals: to slash tariffs by half with a minimum of exceptions, to break down farm trade restrictions, to strip away nontariff regulations, and to aid developing nations. Participation greatly increased over previous rounds. Sixty six nations, representing 80% of world trade attended the official opening on May 4, 1964 at the Palais des Nations.