This paper examines the role of Human Resource (HR) development in Toyota's culture, using the Toyota Motor Manufacturing, Kentucky (TMMK) plant as a case study. It highlights the profound difference in HR practices at Toyota compared to traditional companies, emphasizing the importance of trust, continuous improvement, and employee development in achieving lean management. The paper explores how TMMK responded to a crisis of trust by restructuring its HR function, focusing on building a culture of respect, accountability, and employee advocacy. It also contrasts Toyota's approach to lean management with the traditional view of lean as a technical toolkit, arguing that the latter is destined to fail without a strong emphasis on human development and trust.