1. Department of Mathematics and Statistics, San Diego State University, San Diego, CA 92182-7720
2. Hub for Innovation in Learning and Technology, Michigan State University, East Lansing, MI 48824
3. Department of Chemistry, University of Iowa, Iowa City, IA 52242-1294
4. Center for Research on Instructional Change in Postsecondary Education, Western Michigan University, Kalamazoo, MI 49008-5288