A comparative study of the nature and scope of implementation of turnkey obligations in Iranian law and the model contract of the International Federation of Consulting Engineers (FIDIC)

On of The Important contracts in construction Law Is Turn key contracts. It,s a contract an contractor obliged The whole of Affairs an obligation in the contract. The engineering procurement construction is main ports in this contract. And finally, Delivery key of project to employer. The Main obligation of contractor in this contract fulfilling the Project according to the contractual standard. One of the Effects of Deterening . The time of fulfilment of the obligation is releasing the Guarantee of Good performance and fulfilment the commitment and the Guarantee related to maintenance of project Transfer from contractor to Employer. In this paper there is comparative study between Iranian letter section. A silver book in regard fulfillment of the contract. In other hand according to article 4 of constitution law It is the necessary to comply with sharia. In this study Inestigated fulfilling this contact with juris prudential approach. The effectiveness of investment contracts and the protection of the porties to the constructs depend on investment factors in investment contracts such as turnkey, the nature of terms and effects should be clear. The parties must know when the contract starts and ends.