“…Results from this study are consistent with our prior work indicating students trained in the “aged‐up” STAC program reported increases in knowledge of bullying, knowledge of the STAC strategies, and confidence to intervene in bullying situations (Johnston et al, ). These findings are particularly important as research indicates students may not intervene in bullying situations because they do not know what to do (Forsberg, Samuelsson, & Thornberg, ; Hutchinson, ) and may have low levels of self‐efficacy related to their ability to intervene successfully (Chen, Chang, & Cheng, ; Thornberg, Landgren, & Wiman, ). Thus, increasing both knowledge and confidence are important components of bystander interventions designed to equip students to act as “defenders.”…”