sentences:  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.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.