Enterprise Architecture (EA) is a key factor for success in digital transformation programs in Swedish companies. EA provides a structured framework for analyzing and managing how technology, processes, and business models interact during the transformation journey. For a Chief of Staff, this means using EA to identify dependencies, risks, and opportunities between different business areas and IT systems. EA also helps ensure that digitalization initiatives align with the organization's long-term strategy and that investments deliver the desired effect. In Sweden, where digitalization is a national priority, EA is used to support interoperability, transparency, and compliance with laws like GDPR. By visualizing the transformation journey and involving stakeholders in the planning, CoS can create engagement and drive change in an inclusive and sustainable way.