The author addresses the increasing number of corporate acquisitions and the reasons why they do not always succeed. A successful post-merger integration is essential for a value-enhancing acquisition. Cultural and personnel differences between the two previously separate companies are increasingly cited as reasons for failure. These so-called dealbreakers must be analyzed. Lars Osterhues examines the economic and legal aspects necessary for smooth integration. The focus for cultural post-merger integration lies on the different structures and philosophies of the companies. On the personnel side, the author also discusses management levels and the workforce.