This report delves into the realm of international management, focusing on the operations of Deloitte, a prominent professional services firm. The core of the report examines how national and organizational cultures, particularly from the UK-based head office, influence regional cultures in Brazil, Japan, and Germany. It highlights the importance of understanding local customs, business practices, and communication styles. The report explores the cultural nuances of each region, detailing how Deloitte adapts its strategies to align with local norms. For instance, it points out the differences in formality, time management, and decision-making processes. The conclusion emphasizes the necessity of international management for companies operating globally, stressing the development of appropriate strategies and decision-making processes. The report underscores the need for firms to evaluate both the national culture of the head office and the countries in which they operate. This is all done on the basis of the organization's culture. References include academic literature on international financial management, cross-cultural management, and global sourcing.