Human resources management (HRM) is an approach to personnel management, based on four fundamental principles: • First, human resources are the most important assets that an organization has and their effective management is the key to its success. • Second , that success is more likely to be achieved if personnel policies and procedures are closely linked and make a significant contribution to the achievement of corporate strategic plans and objectives. • Third, the corporate culture and values, the organizational climate, and the managerial behavior that emanate from such a culture will exert a primary influence on the achievement of excellence. Therefore, that culture has to be managed, which means that organizational values may have to change or be reinforced through a continuous effort, starting from the top, to get those values to be accepted and observed in practice. • Fourth, HRM It is a matter of integration: getting all members of the organization to participate and work together, with a sense of common purpose