Robert S. Siegler, PhD, Teresa Heinz Professor of Cognitive Psychology, Carnegie Mellon University; Founder, !e Siegler Center for Innovative Learning (SCIL), Beijing Normal University; Co-Author, How Children Develop (2014, 4th Edition), Children’s Thinking (2004, 4th Edition) and “Taking It to the Classroom: Number Board Games as a Small Group Learning Activity” (2012, Journal of Educational Psychology)