Identifying the Challenges and Requirements of Enterprise Architecture Frameworks for IoT Systems Filip Vanhoorelbeke 1 , Monique Snoeck 2 , Estefanía Serral 1✉ 1 KU Leuven, Warmoesberg, 26, Brussels 1000, Belgium 2 KU Leuven, Naamsestraat 69, Leuven, 3000, Belgium Abstract. Enterprise Architecture Frameworks (EAFs) have been around since the last decades of the 20th century. They are a proven practice to analyze, de- scribe, organize, implement and manage changes in the global architecture of an enterprise's data, processes, applications and technology. Recently, new promis- ing technologies such as big data, machine learning, and the always-and-every- where connected Internet of Things (IoT), have made their way into all sorts of business-generating activities. The vast number of possible connectable devices, with almost infinite useful applications throughout an enterprise such as opera- tions, human resource management, communications, and customer service, demonstrates the holistic nature of IoT. Because of that, making use of IoT cannot be treated in isolation, but should be integrated in all aspects of Enterprise Archi- tecture. Therefore, this paper identifies the main architectural challenges and de- rived requirements of IoT systems for an EAF. A literature study and a question- naire aimed at industry EA experts have been used as main data sources. Keywords: Enterprise Architecture, Enterprise Architecture Frameworks, the In- ternet of Things, IoT. 1 Introduction Enterprise Architecture Frameworks (EAFs) have been around since the last decades of the 20th century, a time where memory and storage were very costly for an enter- prise. However, technology has drastically evolved over the years, bringing along new types of business processes and data applications, and making unclear whether current EAFs are prepared to facilitate the management of such evolving technologies, data, and processes. One of the promising new technologies that finds itself in the adoption phase is the Internet of Things (IoT) . More and more does IoT find its way in the daily lives of our society, opening a whole world of business opportunities. IoT is still often seen as not more than a money-bleeding gimmick which has yet to prove itself as being a potential value-adding asset. It remains to be seen if the oppor- tunities of IoT can outweigh the challenges it faces, or it becomes a liability instead of delivering business value. This is where an EAF could help by providing methodologies for constructing a to-be architecture including IoT, reference material to aid the process of building such architecture, and means to inform and collect input from different