This report provides a detailed analysis of leadership and management within the service industry, exploring various classical management theories such as bureaucratic, scientific, and behavioral approaches, and their application within the service sector. It delves into the roles and leadership styles, including authoritarian, participative, delegative, transactional, and transformational leadership, with specific examples from Marriott International. The report examines the administrative and direction manners within a service sector organization, as well as internal and external factors influencing management styles and structure. It also evaluates contemporary management skills, including 'firm and mushy expertise,' and discusses future administrative and leadership skills required by the service sector, offering insights into change management within different service industry organizations. The report uses Marriott International Inc. as a case study to illustrate the practical implementation of these concepts.