“…An effective heuristic to alleviate these difficulties is the use of diagrams ( Hembree, 1992 ; Stylianou and Silver, 2004 ; Jitendra et al, 2007 ; Boonen et al, 2014 ). Diagrams facilitate self-explaining which in turn leads to deeper understanding ( Ainsworth and Th Loizou, 2003 ), promote the construction of mental models for drawing inferences, and provide guidance towards appropriate learning behaviour ( Butcher, 2006 ; van der Meij et al, 2017 ). More specifically in mathematics, diagrams enable the construction of accurate solutions by enhancing information and knowledge access ( Chu et al, 2017 ; Cooper et al, 2018 ).…”