<Tr> <Th> Depositary </Th> <Td> The Secretary - General of the United Nations </Td> </Tr> <Tr> <Th> Languages </Th> <Td> Arabic, Chinese, English, French, Russian, and Spanish </Td> </Tr> <P> The United Nations Convention on Contracts for the International Sale of Goods (CISG; the Vienna Convention) is a treaty that is a uniform international sales law . It has been ratified by 89 states that account for a significant proportion of world trade, making it one of the most successful international uniform laws . The State of Palestine is the most recent state to ratify the Convention, having acceded to it on 29 December 2017 . </P> <P> The CISG was developed by the United Nations Commission on International Trade Law (UNCITRAL), and was signed in Vienna in 1980 . The CISG is sometimes referred to as the Vienna Convention (but is not to be confused with other treaties signed in Vienna). It came into force as a multilateral treaty on 1 January 1988, after being ratified by 11 countries . </P>

What contract law is applicable in an international sale of goods