The three main parts in the contracts related to the projects:
1. Agreement
2. General Conditions
3. Private conditions

Agreement:
An agreement between the parties, which includes the details of the parties to the contract, the subject, the time, the amount, the manner of expansion, etc. It's a project، it's written.

Contract Agreement

General Conditions:
The general terms of the contract in contracting contracts include a series of texts, contractual titles, clauses, and sub-clauses, which are the same, so that according to the agreement, the employer and the contractor must fully accept the general conditions and in case of violation, they must be accountable to the legal authorities. Also, due to the complexities that can govern large contracting contracts, in the general conditions of the contract, all the situations that may occur between the parties to the contract have been determined.

Contract General Conditions

Private Conditions:
Private conditions are different from each other in different types of contracts based on the subject of the contract and are considered as a kind of complement to the general conditions of the contract, so that no case in the private conditions of the contract can violate the articles of the general conditions. In contrast to the general conditions in contracting contracts, the specific conditions of the contract are not specified in any specific document. According to Article 4 of the General Conditions of the Treaty, the private conditions must not in any way violate the general conditions of the contract and should only be regulated in their completion. If there is any ambiguity in the private conditions of the contract, the general conditions will be enforced..

Definitions related to exchange rate rates:
Currency Funds: All types of funds other than the country's common currency (Rials) such as Euros, Dollars, Dirhams, Yen, Yuan, etc. are applied.
Exchange Rate: The exchange rate of the country's currency (Rial) with each of the foreign exchange funds.
Guarantees: Includes all the guarantees stated in the company's trading regulations, such as participation in the prepayment tender, performance of obligations on the account, etc.
Foreign Exchange Contracts for the Purchase of Services, Goods and Rights: All tenders, transactions, contracts, agreements, orders, etc. are held and concluded in any of the transaction ceilings other than the country's common currency (rials).
Sana ُsite(sanarate.ir): A website designed by the Central Bank of the Islamic Republic of Iran, where the exchange rate of the country's currency (rial) with other currencies is announced by the Central Bank.
Currency exchange rate basis: The weekly average of buying and selling of foreign exchange remittances (half) is on the Senate website. If the rates announced on the Senate website are removed, the basis for the currency exchange rate will be the rates announced by the Central Bank through official sources.

EPC Contracts with the term F or F+:
In typical EPC contracts, the employer is responsible for providing capital to complete the contract. However, sometimes this is delegated to the contractor due to reasons such as the employer's lack of sufficient financial resources. For this reason, sometimes we see the term F or F+ (FINANCE) used alongside EPC. In this case, two situations arise:
EPCF: The contractor is responsible for providing financing and capital for completing the contract.
EPCF+: The contractor is responsible for introducing the investor.
In EPCF contracts, the contractor assumes the costs himself and receives his costs along with the rate resulting from the investment after completing the contract, which is called the EPCF contract model.
In EPCF+ contracts, i.e. the contractor introduces the investor, two contracts are basically concluded. A contract between the investor and the employer and a contract between the EPC contractor and the employer, which is called EPCF+.