1. Division of Educational Leadership, Policy and Foundations, University of Missouri–Kansas City, Kansas City, MO 64110
2. Graduate School of Education and Information Studies, University of California, Los Angeles, Los Angeles, CA 90095
3. Department of Sociology, University of Virginia, Charlottesville, VA 22904
4. Department of Instructional Technology & Learning Sciences, Utah State University, Logan, UT 84322-2830