Abstract
The main institutions of Europe are the Commission, the Council and the Parliament, and they are the symbols of a successful European integration. They maintain a certain balance of power between the small and large member states and this balance has been maintained for about 45 years. Since the current situation of enlargement is mainly an addition of a large number of small states : it increases the importance of maintaining the balance between the large and small states, and it also arises the crucial question of how to reform the institution system effectively. Is it a matter of equality versus efficiency ? Is the current situation of enlargement threatening to destabilise the relationship between the small and large member states ?
