25 th Bled eConference Special Issue June 17 - 20, 2012; Bled, Slovenia Inter-organizational Information Systems: From Strategic Systems to Information Infrastructures Stefan Klein University of Muenster, Germany stefan.klein@uni-muenster.de Kai Reimers RWTH Aachen University, Germany reimers@wi.rwth-aachen.de Robert B. Johnston University College Dublin, Ireland robert.johnston@ucd.ie With contributions by: Michael Barrett Cambridge University, UK m.barrett@jbs.cam.ac.uk Joan Rodon Mòdol ESADE, Spain joan.rodon@esade.edu Yao-Hua Tan Delft Uni. of Technology, The Netherlands y.tan@tudelft.nl Stefan Henningsson Copenhagen Business School, Denmark sh.caict@cbs.dk Abstract This paper reports on a series of panels and workshops held at the Bled eConference since 2004. It aims at reconstructing the developing understanding of Inter-organizational Information Systems (IOIS) over the years as evidenced by these workshops, which have been designed to provide a forum to discuss emerging topics, fields, and strategies for IOIS research on a network and industry level. This paper provides an overview of the workshops and a detailed coverage of the last one in order to give a thorough and vivid account of its contributions. The paper not only takes a historical lens in documenting the workshops but also in discussing the transformation from strategic systems to information infrastructures. It reflects the enabling role of the Bled eConference for workshops series and the workshops’ contribution to the Bled conference. Keywords: Inter-organizational Information Systems, Inter-organizational Information Infrastructures, Industry and National Level of Analysis, Evolution of IOIS 1 Introduction Inter-organizational information systems (IOIS) are widely regarded as key enablers of structural and institutional change. IOIS now have a five decade history and there exists a 302