The United Nations Convention on Contracts for the International Sale of Goods (CISG) founded in 1980 is one of the most successful international treaties in the field of trade. This Convention applies to sales contracts between buyers and sellers having their registered offices in countries which are members of the Convention. On December 18th, 2015, Vietnam officially ratified its accession to the CISG to become the 84th member of the Convention. The Vienna Convention went into effect on January 1st.