As far as services are concerned, the situation is more complex: in many cases, the supplier and the customer are in the same place as for tourism. This means that there are four possibilities of movement: the service moves across the border; the customer crosses the border to benefit from the service; the producer crosses the border to provide the service through a commercial establishment; or the producer only temporarily crosses the border to provide the service. Accordingly, the GATS Agreement defines four «modes of supply» for trade in services (see box). • Improve access to projects financed by international financial institutions for service enterprises in developing countries and countries with economies in transition. With a few exceptions, the GATS covers all services. The treaty was created to extend the multilateral trading system to the services sector, as provided for in the General Agreement on Tariffs and Trade in Goods (GATT). • promote the benefits that service enterprises derive from trade liberalization among government officials. . . .