The difference between credit unions and banks is clearly is apparent when comparing the structure of assets and liabilities of credit unions and banks. Cooperation between credit unions, how they would not have been named, took place always, from the moment when the movement moved outside one credit union. Credit unions of the open type are still controlled by their members, but at the same time provide services to people who are not its members (external customers). The supreme body of the World Council of Credit Unions is the Assembly, which elects the president and the board of directors of WOCCU. The right to use the services of the credit union have only its members.