This essay critically evaluates the impact of Human Resource Management (HRM) practices on enhancing business performance, focusing on areas such as recruitment and selection, training and development, and performance management. It analyzes the role of line managers in managing human resources, including the implications of employment law and actions to improve their effectiveness. The analysis incorporates practical examples from Aston Martin (UK) and another non-UK organization, examining the impact of strategic HRM, relevant theories like the Organizational Lifecycle theory and Strategic Contingency theory, and the benefits and challenges of HRM approaches. The essay also discusses employment laws, such as the Equality and Range Act 2010 and the Sex Discrimination Act 1975, and their influence on HRM practices, providing a comprehensive overview of how effective HRM can drive organizational success.