The Contra Costa County. The purpose of the CISG is to provide a modern, uniform and fair regime for contracts for the international sale of goods.See the ITC Model Contract for the International Commercial Sale of Goods (standard and short versions),. The CISG, which deals with both contract formation and the obligations of the parties, carefully balances the interests of the buyer and seller. This policy tracker summarizes the key economic responses governments are taking to limit the human and economic impact of the COVID-19 pandemic.