“…Indicators of student disengagement (see Table 4) were identified considerably less often across the corpus, which could be explained by the purpose of the studies being to primarily address/measure positive engagement, but on the other hand this could potentially be due to a form of self-selected or publication bias, due to less frequently reporting and/or publishing studies with negative results. The three disengagement indicators that were most often indicated were frustration (n = 33, 14%) e.g., (Ikpeze, 2007), opposition/rejection (n = 20, 8%) e.g., (Smidt, Bunk, McGrory, Li, & Gatenby, 2014) and disappointment e.g., (Granberg, 2010), as well as other affective disengagement (n = 18, 7% each). Following a slightly modified version of Bower's (2016) educational tools typology, 17 broad categories of tools were identified (see Additional file 4 for classification, and 3.2 for further information).…”