In the article "An Information Systems Design Theory for Service Network Effects" Christian Janiesch from the University of Würzburg, Christoph Rosenkranz from the University of Cologne and Ulrich Scholten from VentureSkies describe design principles of a design theory for the design of service platforms with special consideration of network effects. The article is published in the Journal of the Association for Information Systems (VHB A). A preprint is available on SSRN: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3449260