MLI Researchers David Gagnon, Breanne Litts and Garrett Smith worked with colleague Chris Holden (University of New Mexico) to produce a book chapter about scaling augmented reality through an open source approach. The chapter describes ARIS, a free tool for creating mobile learning experiences, which was originally developed by the Games+Learning+Society research group and DoIT ENGAGE program. As of March 2014, ARIS has gathered over 20,000 users and the support of institutions such as the MacArthur Foundation, The Pearson Foundation, the Library of Congress Teaching with Primary Sources Initiative and the Minnesota Historical Society. The chapter outlines the story of how the software was developed so that experimentation with mobile learning design could be distributed among an international community of users and decentralize the maintenance of the software. The book is available from Amazon, Barns & Noble and various other book sellers.