International human resource management deals with procuring, allocating, and motivating human resources across international businesses. HR managers in global organizations face the challenge of balancing the integration of HR policies across subsidiaries with allowing flexibility for different business and cultural settings. IHRM considers three dimensions: human resource activities in different countries, types of employees from host, home, or third countries, and reconciling HR practices between these countries. Theoretical models of IHRM include the matching, Harvard, contextual, 5P, and European models which approach IHRM from different perspectives like resources, stakeholders, external context, and constraints.