... Diverse instruction and guidance strategies were described and varied based on who or what provided support. Human tutor strategies included verbal guidance (n = 35) [ [30,34,[62][63][64][65][66][67][68][69][70][71][72][73][74][75][76], modelling (n = 10) [32,46,50,54,57,61,[77][78][79][80], checklists (n = 3) [49,81,82], collaboration scripts (n = 2) [83,84] and encouragement (n = 1) [59] (Table 2). Computer tutor strategies were audio prompts (n = 16) [34, 39, 58, 85-92, 94-97, 126], visualization (n = 11) [55,60,85,90,91,95,[98][99][100][101][102], step-by-step guides (n = 8) [30,31,49,76,98,99,103,104], modelling (n = 6) [45,56,[105][106][107], intelligent tutoring systems (n = 3) [108][109][110] and pause buttons (n = 2) [93,111]. ...