Archive of European Integration  The Archive of European Integration (AEI) is an electronic repository and archive for research materials on the topic of European integration and unification. The AEI contains two types of documents:  In January, 2016 the AEI contained over 41,800 EC/EU documents and more than 7,300 privately produced documents, making it the largest online repository of EU documents in the world except for EU websites. Since the creation of the AEI in February 2003, the University Library System (ULS), University of Pittsburgh, Pennsylvania, United States has provided the technical and material support for the AEI. The ULS department of Information Technology - under the directorship of Tim Deliyannides - hosts and maintains the AEI as part of its D-Scribe Digital Publishing program. The AEI system is powered by EPrints 3, free Open Source software developed by the School of Electronics and Computer Science, University of Southampton, UK. The Archive of European Integration (AEI) was initiated in early 2003 by Dr. Phil Wilkin, then Social Sciences Bibliographer - and current Editor of the AEI - at the ULS, in collaboration with Dr. Michael Nentwich, Austrian Academy of Sciences, Institute of Technology Assessment, Vienna, Austria. Nentwich was then managing editor of the European Research Papers Archive (ERPA). ERPA was an Internet-based platform providing access to the papers of several research institutions focusing on European integration. ERPA featured only referred high quality series, featuring some form of refereeing, and the AEI was designed to complement ERPA by collecting research materials on European integration which did not necessarily meet ERPA's high quality standards. ERPA was archived on 1 March 2015. In fall 2004, Barbara Sloan, then Head of Public Inquiries, Delegation of the European Union to the United States, Washington, DC, (then the Delegation of the European Commission to the United States) began working with the AEI on digitizing and uploading EC/EU documents onto the AEI. The Delegation's EU library collection, founded in the mid-1950s, is by far the largest collection of EC/EU documentation in North America. A comprehensive guide to this collection can be found at European Union Archival Collection at the University of Pittsburgh, pp. 31–41. The Delegation donated this collection - spanning years early 1950s to 2004 - to the ULS in 2007. The collection contains both a shelf section and a "research files" section.