In mergers and acquisitions (M&A), Enterprise Architecture (EA) is an invaluable tool for analyzing and planning the integration of the processes, IT systems, and structures of two organizations. For a Chief of Staff (CoS), this means using capability mapping and architecture analyses to identify overlaps, gaps, and potential synergies between the merged companies. EA provides a clear picture of which systems and processes need to be harmonized, what risks exist, and how best to realize business value. In Sweden, where consensus and stakeholder dialogue are central, EA helps to create a common understanding and commitment to the integration plan. CoS can also use EA to ensure that the integration complies with Swedish laws and regulations, and that the change is communicated clearly to all relevant parties.