We gratefully acknowledge the generous support in cash and kind from the following sponsors:
 Apangea Learning
Pittsburgh, PA 
 Edalytics, LLC
Pittsburgh, PA
 Grockit
San Francisco, CA
 Kaplan, Inc.
New York, NY
 Learning Research and Development Center
University of Pittsburgh
National Science Foundation
Division of Information and Intelligent Systems
Human-Centered Computing Program
Washington, DC
 Pittsburgh Science of Learning Center
www.learnlab.org
  School of Education
University of Pittsburgh
Intelligent Systems Program
University of Pittsburgh
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