The consideration is an additional requirement in English law before a contract is applicable.  A person who wants to impose an agreement must prove that he or she has brought into the good business something that has “something valuable in the eyes of the law,” either by giving an advantage to another person or by harming his or her claim.  In practice, this does not mean simple gratitude or love, does not mean anything that has already been done in the past, and does not promise to fulfill a pre-existing duty, unless the accomplishment takes place for a third party.  Metaphorically, reflection is “the price for which the promise is bought.”  It is controversial that it leads to a complexity that legal systems that do not remove their inheritance from English law simply do not have.  In reality, the doctrine of consideration operates to a very small extent and creates little difficulty in business practices. After the reform in the United States, in particular, treaty revision 90, which allows all promises to engage if they result in “injustice,” a report by the Law Revision Committee, the Statute of Fraud and the Doctrine of Consideration suggested that the poor payment of debts promises in writing, and promising to meet existing obligations. who promises to keep an offer open and the promises on which another relies to their detriment should be binding. The report was never translated into legislation, but almost all of its recommendations were transposed by case law, albeit with difficulty. Not all agreements are necessarily contractual, as the parties are generally considered to be legally bound. A “gentlemen`s agreement” should not be legally applicable and “compulsory only in honour.”    A related doctrine is a “common error” which, since Lord Phillips MR`s decision in The Great Peace, is much the same as frustration, except that the event that makes it impossible to execute a contract takes place before and after the conclusion of a contract.  A “common error” differs from “mistakes” that occur between offer and acceptance (i.e., there is no agreement at all) or so-called “identity” cases resulting from fraudulent misrepresentation (which generally invalidates a contract, does not invalidate it, unless it is concluded in a written and remote document) because it is based on the seriously difficult performance to achieve.