The proliferation of broadband mobile devices, which many students bring to school with them as mobile phones, makes the widespread adoption of AR pedagogies a possibility, but pedagogical, distribution, and training models are needed to make this innovation an integrated part of education, This paper employs Social Construction of Technology (SCOT) to argue for a "participatory" model of scaling by key stakeholders groups (students, teachers, researchers, administrators), and demonstrates through various cases how ARIS (arisgames.org)--a free, open-source tool for educators to create and disseminate mobile AR learning experiences--may be such a model.