The UN Convention of 11 April 1980 (or “Vienna Convention”) on contracts for the international sale of goods - the CISG - is an international, uniform sales law for cross-border sale of goods contracts. As an international Convention, the CISG is open to ratification by any State in the world. Pursuant to Article 1(1) (a), it applies to sales of goods contracts between contractual parties whose places of business are in different Contracting States. According to Article 1(1) (b), it furthermore applies when the rules of private international law point to the law of a Contracting State as the applicable law. The application of provisions of the CISG can be waived by the parties to the sales contracts.