In order to protect themselves, contractors may include a clause stating that the contract contains the entire contract. This is useful because the court will use the language of the contract to decide whether both parties wanted it to be the final version of the terms. In contract law, an integration clause, a merger clause (sometimes called a complete contractual clause, particularly in the United Kingdom)  is a clause in a written contract that makes the contract a complete and final agreement between the parties. It is often placed at the end or towards the end of the contract. Pre-contract documents that the parties wish to include in the contract must be collected with him or explicitly mentioned in the contract documentation. In criminal law, integration clauses are included in oral arguments. For example, in the 6th circuit of United States v. Hunt, the accused and the government agreed to an integration clause under Rule 11 of the Federal Code of Criminal Procedure. Under this rule, a defendant is not in a position to later indicate that there have been additional ancillary agreements, as the fundamental agreement becomes final. An exception is made when both parties agree to an additional agreement, as was the case in another case in the 6th District, Peavy v. United States.
A party wishing to include an integration clause in a contract should ensure that the clause uses language used and accepted by the courts. An example of a LexisNexis integration clause is: “The parties intend to make, by this declaration of their agreement, the full, exclusive and fully integrated declaration of their agreement. As such, it is the only expression of its consent, and it is not bound by other agreements of any kind. When a contract contains the entire agreement between the two parties, it is considered an integrated contract or an integrated contract. Once the integrated contract is signed, neither party can claim that other written or oral promises have been made that would amend or terminate what is in the treaty. Sometimes the parties approve a partially integrated contract that omits some of the terms of the agreement. A court will generally decide that a contract is an integrated contract, unless there is strong evidence that this is not the case. An agreement is incorporated when the parties accept the letter or the writings as a definitive and complete expression of the agreement.
The terms of the contract are considered to be the final version of the agreement between the parties. It is the decision if there are other conditions, it is that the court has prior oral and written provisions. The court often does this by comparing all proven written and oral agreements. If the parties have agreed to a contract, it will be considered an integrated contract, unless there is explicit language or evidence that the letter was not the final version of the agreement.