“…Contingency, the dynamic adaptation of agents in a learning situation in the form of scaffolding, (Wood & Wood, 1999), rests on a moment-by-moment characterization of the state of a learner, or of a group of learners. In particular, the development of intelligent tutoring systems (ITS), hinging on online models of the learners which inform the ITS regarding its next moves in a learning interaction, inherently depends on better and more complete ways of characterizing the cognitive and affective states of the learner during a learning task, as ongoing research in this direction testifies (Azevedo, Moos, Johnson, Chauncey, 2010;Chi, VanLehn, Litman, & Jordan, 2011;D'Mello & Graesser, 2012). Recent research on tutoring has shown that the frequency of this characterization of the state of the learner is particularly important (Van Lehn, 2011).…”