This book commemorates Prof. Dr. René Wagenaar and illustrates the impact he had on research and discussions on research topics. It is divided into four parts, each part relating to a specific area of Prof. Wagenaar's career and also more or less reflecting the work he did at the three universities that played a role in his career, i.e. Erasmus University of Rotterdam, the Free University of Amsterdam and Delft University of Technology. The first part of the book describes how Prof. Wagenaar started working on EDI and inter-organizational systems at Erasmus University. At the Free University.