Henderik A. Proper is Head of Academic Affairs at the Luxembourg Institute of Science and Technology (LIST) in Luxembourg, and senior research manager within its IT for Innovative Services (ITIS) department. Since 2003, he has been a professor at the Radboud University, Nijmegen, the Netherlands and since May 2017 also an adjunct professor at the University of Luxembourg. Robert Winter is Professor of Business & Information Systems Engineering at the University of St. Gallen (HSG), Switzerland, and Director of HSG's Institute of Information Management. His research interests include design science research methodology, enterprise architecture management, transformation management and the management of very large IT projects and programmes. Stephan Aier is assistant professor at the Institute of Information Management at the University of St. Gallen, where he heads the Architectural Coordination Group. His research interests are in architecture, integration, and transformation management, and he is responsible for fundamental research funded by public research organizations such as the Swiss National Science Foundation as well as for applied research funded by industry partners. Sybren de Kinderen is assistant professor at the University of Duisburg-Essen, Germany.  During the ACET programme, he worked as a post-doctoral research fellow at the Luxembourg Institute of Science and Technology (LIST) in Luxembourg.