Enterprise architectures (EA) are considered promising approaches to reduce the complexities of growing information technology (IT) environments, while keeping pace with an ever-changing business environment. However, the implementation of enterprise architecture management (EAM) has proven difficult in practice. Many EAM initiatives face severe challenges, as demonstrated by the low usage level of enterprise architecture documentation and a lack of authority of enterprise architects when it comes to enforcing EAM standards and principles. This motivates our research: Based on three field studies, we first analyse EAM implementation challenges that arise when EAM is treated as a dedicated and isolated initiative. Following a design-oriented paradigm, we then suggest a design theory for architecture-driven IT management (ADRIMA) that helps organizations implement EAM as an integral part of IT management. This theory summarizes prescriptive knowledge related to embedding EAM practices, artefacts, and roles in the existing IT management processes and organization.