This report delves into the critical aspects of leadership and change management within the service industry, focusing on the practical application of Lewin's Change Management Model and the ADKAR model. The analysis begins by establishing the significance of change management in organizations, particularly within the competitive service sector, and underscores the pivotal roles of leaders and managers. The report then explores Lewin's three-stage model (Unfreeze, Change, Refreeze) and the ADKAR model (Awareness, Desire, Knowledge, Ability, Reinforcement), using Holiday Inn and Intercontinental Hotels as case studies. It examines how these models are employed to adapt to market demands, improve employee training, and ensure the successful implementation of organizational changes. The report also assesses the impact of these management approaches, highlighting the positive outcomes for both management and leadership in fostering a diversified and adaptable work environment. The conclusion emphasizes the importance of these change management strategies for sustained success in the dynamic service industry.