This chapter introduces human resource management (HRM) and its relationship to the overall management process. It discusses the roles of line managers who direct subordinates' work and staff managers who assist and advise line managers. The chapter also outlines the responsibilities of line managers in HRM areas like hiring, training, performance management, and employee relations. Additionally, it describes high-performance work systems that aim to improve organizational outcomes through practices such as extensive training, team structures, and contingent rewards. The chapter emphasizes the importance of metrics and measurement in demonstrating HR's value and strategic contribution through tools like the HR Scorecard.