“…In 43 interventions, the teacher’s role was central to the teaching process. Teachers structured the lessons, introduced content, proposed tasks, and distributed homework assignments, often according to detailed instructions [ 12 , 13 , 18 – 20 , 22 – 24 , 28 , 29 , 46 , 49 , 51 – 53 , 60 , 65 , 67 , 68 , 77 , 78 , 80 , 82 , 85 , 88 , 90 , 92 , 97 , 98 , 101 , 102 , 104 , 106 , 112 , 117 , 120 , 124 , 125 , 128 , 130 – 134 ]. In every fourth intervention, teacher-centered and peer-to-peer methods were combined [ 12 , 13 , 19 , 20 , 22 – 24 , 46 , 53 , 65 , 67 , 80 , 85 , 90 , …”