Is the obligation to inform the parties in a contractual relationship stemming from the implementation of the works of the contract or is it an independent obligation? Therefore, if each of the parties refuses to exchange the available, sufficient and complete information about the subject, conditions of validity and other elements and elements of the contract, what effect will it have on the conclusion, implementation of the works or the survival of the contracts? with the principles and themes resulting from the prohibition of proof of fraud in transactions in terms of the hesitation of the subject of the transaction (ignorance of the existence or quantitative and qualitative characteristics of the transaction) or the inability to execute contracts, or finally, the occurrence of false perceptions, in terms of the lack of exchange of information and knowledge Complete and sufficient, in order to conclude contracts or implement the works of contracts, we reach the idea that the necessity of creating a balance in acquisition or surrender requires solid foundations such as the principle of cooperation in contracts and contracts to fully inform the parties against each other.