On January 1, 1988, the United Nations Convention on Contracts for the International Sale of Goods (the Convention) became effective in the United States. In general, the Convention (also referred to as the “Vienna Sales Convention,” the “Sales Convention,” the “CISG,” or the “UN Convention”) applies to contracts for the sale of goods between enterprises having their places of business in different countries, provided these countries have adopted the Convention. Freedom of contract, however, is a fundamental principle of the Convention, and the parties may opt out or modify the effects of its provisions.