After a merger or acquisition, the Chief of Staff (CoS) is often responsible for establishing and leading the Integration Management Office (IMO), which coordinates the entire integration process. The CoS defines integration goals, sets up governance structures, and ensures that the integration plan aligns with the business strategy. The CoS coordinates cross-functional teams, monitors milestones, and reports regularly to management. An important part is managing change management and communication, ensuring that all employees understand the purpose, goals, and expectations. In Sweden, where MBL and trade union dialogue are central, the CoS is responsible for involving trade union representatives and ensuring that legal requirements are followed. The CoS also works to identify and manage cultural differences, which is crucial for creating a common corporate culture and avoiding resistance. By combining structure, clear communication, and responsiveness to the organization’s needs, the CoS can drive successful integration.