The internationalization of business activities raises new issues in the recruitment and expatriation of staff, as well as training, ethics and management of subsidiaries. Staff must deal with cultural, social, institutional, legislative and economic situations that are foreign to them. In order to facilitate cultural adaptation while ensuring the congruence and efficiency of human resources, companies implement international HR strategies. Three main objectives: 1) Understand the role of HR function in international companies and understand the different issues and international strategies of human resources management. 2) Raise awareness of cultural differences and their implications for HRM practices. 3) Examine the consequences of firm's internationalization for the management of international staff mobility and the standardization of HRM practices.