Breach of contract – this legal term is used in the Law of Contracts. The breach of contract details the actual failure to do what one promised to do under a concluded by them contract. Proving a breach of contract is a prerequisite of any suit for damages based on the contract. The breach of contract should be claimed (pretended) by the right party – usually in the form of notary invitation to be served to the other party. Later this written document stating the breach of contract has the role of legal ground for entering civil claim at the civil department at the local court. A similar term is “breach of duty”.