The author refers to one of legal institutions in which the process of economic globalization had influenced in a direct way: the contract of international sale of goods, according to its regulation in the United Nations Convention of 1980, adopted in Colombia by means of Law 518 of 1999, which went into effect August 1st of 2002. In first chapter, the author presents the relations between the international sale of goods and the globalization, particularly the aspects of the location of this international regulation inside the harmonization processes and legal unification; as well as other general aspects. Following the process of formation of contracts and its regulation in the Convention of International Sale of Goods, the author analyzes in second chapter the steps of preliminary treatments, its offer and acceptance, referring not only to doctrinal aspects, but also to jurisprudence of international courts. To acquire a better knowledge of the process of formation of contracts, the author refers to the treatment that some of the analyzed figures have in comparative law.