“…These systems can evaluate student knowledge growth over time, aiming to determine the best sequence of problems or tutor moves that will maximize learning from the tutor (Chi, VanLehn, & Litman, 2010). Recently, this work has further begun to consider affect (e.g., boredom and engaged concentration), gaming the system, and off-task behaviours (Fancsali, 2014;Baker, Corbett, & Koedinger, 2004;Roll, Baker, Aleven, & Koedinger, 2014). The primary purpose of the measurements is to determine ways to help students learn more from the system.…”