The Chief of Staff (CoS) plays a crucial role in cultural due diligence, which involves systematically mapping and analyzing values, leadership styles, decision-making processes, and work norms in both the acquiring and the acquired company. The CoS initiates cultural analyses early through workshops, interviews, and surveys, often with the support of frameworks such as Hofstede, Denison, or McKinsey Culture Compass. The goal is to identify potential cultural clashes and opportunities for collaboration. In Swedish and international businesses, it is particularly important to understand differences in perspectives on hierarchy, decision-making, and communication. The CoS is responsible for integrating the results into the integration plan and taking action to build a common culture, for example through leadership programs, joint value assessment workshops, and continuous follow-up. By working proactively with cultural due diligence, the CoS reduces the risk of failed integration and increases the chance of realizing the full value of the deal.