The purpose of the CISG is to provide a modern, uniform and fair regime for contracts for the international sale of goods. An international sales contract is an agreement between a buyer and a seller that identifies the parties in the transaction, the goods or services being sold.In their day-to-day activities, traders and business people around. (''Mattel'') to initiate a massive. F Ferrari, 'Fundamental. Breach of Contract Under the UN Sales Convention: 25 Years Article 25 CISG' (2005) 3 International. Sale of Goods (Convention) was adopted in Vienna on April 11, 1980. t. A contract is an agreement that specifies certain legally enforceable rights and obligations pertaining to two or more parties. Business Law Review 82 at 83. Business Law Review 82 at 83.