Even if the parties have a good relationship and trust each other, the use of a contract provides an additional level of assurance that the commitments entered into under the treaty will be fulfilled as the parties themselves had intended. Contracts are generally recommended over less stringent agreements in all official or commercial matters, as they offer additional protection. Most of the principles of the Common Law of Contracts are described in the Restatement of the Law Second, Contracts published by the American Law Institute. The Single Commercial Code, the original articles of which have been reproduced in almost all countries, is a legal right that governs important categories of contracts. The main articles dealing with contract law are Article 1 (General provisions) and Article 2 (sales). .