terms, a buy-back transaction is a method of trade where plants, machinery, production equipment and technology is supplied (by a domestic or foreign private firm), in exchange for the goods that will be produced directly or indirectly by means of such facilities. Under this scheme, the foreign partner that makes the initial investment can repatriate the return on the investment (at a pre-agreed fixed rate) through goods and services produced by the project. While many foreign companies believe that this method is a mere financing instrument for Iran, it is more accurate to say that it is a compromise formula for foreign investment in the short-run. In the medium to long-term, more appropriate laws and regulations will probably replace the buy-back scheme. In other words, once the constitutional concerns have been dealt with, the foreign partners of buy-back agreements can take over the projects that they are involved in, or they can enter into a joint venture with an Iranian partner. The Iranian (or Integrated) Petroleum Contract (IPC) Some of the main criticisms of the buyback contracts include lack of flexibility of cost recovery and in some cases, the NIOC's limited expertise to reverse field decline rates in comparison to the International Oil Company (IOC) that developed the field. The Integrated Petroleum Contract (IPC) will require the IOCs to fulfill Iran's local content requirement, which will be 51% of the contract and transfer of technology. IPCs will be offered for work on somewhere between 34 and 74 oil fields and could last for the duration of a field's life. In 2013 Iran also announced for the first time since the Iranian Revolution of 1979, the offering of production sharing contracts (PSCs) for the most complicated and difficult projects, such as deep-water wells in the Caspian Sea (the details of which will be revealed in December 2015 in London). Build-Operate-Transfer (BOT) Recent regulations have introduced the Build–operate–transfer (BOT) scheme for Iranian projects. This is a rather new possibility in the Iranian market. In this scheme, the foreign partner invests in one project, which is then operated for a certain period of time by the foreign investor before it is fully transferred to the Iranian government. Iranian authorities are showing some flexibility regarding the BOT, which could potentially pave the way for more foreign investment in the market. Free trade zones and special economic zones Iran's interest in free zones can be