the first thing is which legal system the country belongs to.
iran, a country under theocratic islamic law；but both parties may agree to accept the laws of a third country, like the laws of england etc. as applicable laws of the contract .
the second thing is the amount of the project .
firstly， key points of cost calculation before bidding
1.government efficiency：: it may take a long time to be approved by local authorities;
2. contractor's autonomy；
3. risk of access of construction site： it is necessary to take the security cost into the epc proposal;
4.risk of local residents obstructing construction：easy access to the site is a precondition；
5.risk of obtaining land and permit of construction(accessibility,feasibility );
6 matching degree of the skill of project core personnel: it is better to mobilize the skilled chinese workers to the site;
7.project duration calculation which has to consider natural factors such as wind,rainy season,and high temperature；which may affect the duration of the project；
secondly, key points of the contract of international project of epc
1. the risk of exchange rate fluctuations by entrusting professional bank;
2. export credit projects are paid in us dollar,in gb pound or in euro, which not only generates foreign exchange but also avoids exchange rate risks;
3. risk aversion insurance: 6% unforeseeable premium (contingency) is added into the bidding cost, and the insurance company underwrites all risks of the project;
4.equipment input: excavator, bulldozer, dump machine, loader, vibration grinding, drilling machine, fully considering the transportation cost(esp. extra-large size equipment);
5. schedule management: personnel, property and instrument;
6.cost management: personnel, property, and instrument;
7. subcontractor management: expert counseling, special funds, migrant workers ledger, supervision of project quantity;
8. safety production management:supervisor, site representative of party a, safety production committe;
9. project quantity management:concealed works acceptance, regular quantities acceptance and visa;
10. project quality management: warehouse entry and exit of building materials, regular inventory quality control；
11. communication management: the headquarters, overseas departments, design units and subcontractors form the project leading group;
other: to execute the project, department like administrative, financial, legal (contract), cost management are also necessary.