The Agreement was negotiated during the Tokyo Round, but at that time its acceptance was voluntary. Adherence to the Agreement became mandatory as part of membership in the WTO subsequent to the Uruguay Round. The Agreement is administered by the WTO Committee on Customs Valuation, which holds two formal meetings a year. The Agreement also established a Technical Committee on Customs Valuation, which operates under the auspices of the World Customs Organization (WCO), with a view to ensuring, at the technical level, uniformity in interpretation and application of the Agreement.