130 The Professional Counselor | Volume 14, Issue 2 Moran et al., 2019). The decrease in defending behavior among students who did not witness bullying post-training can likely be explained by the lack of opportunity to utilize defending behavior. Finally, we examined engagement in the five steps of the Bystander Intervention Model as predictors of post-training defending behavior. Although prior research indicates that engagement in each of the five steps of the Bystander Intervention Model correlate positively with defending behavior among middle school students (Jenkins & Nickerson, 2016), this is the first study to examine the unique effect of engagement in each of the five steps on post–bystander training defending behavior. Results of the regression analysis indicated that Notice the Event and Decision to Intervene were significant predictors of defending behavior. These findings are particularly promising, as engagement in the steps Notice the Event and Decision to Intervene both increased from baseline (T1) to the 6-week follow-up (T2) for students who witnessed bullying after training. Thus, among students who witness bullying as bystanders, the STAC intervention was effective in increasing engagement in the two steps of the bystander model that are uniquely associated with defending behavior. Limitations and Future Research Although this study extends research on the Bystander Intervention Model, as it is the first study to examine engagement in the steps of the model in the context of a bystander intervention, there are some limitations. First, the sampling frame included a single recruitment location at a private school in the Northwest, and our final sample was relatively small and composed of English-speaking students who were primarily White. Thus, we cannot generalize our findings to students enrolled in ethnically diverse, public middle schools. Further, because the current study did not include a control group, we cannot make causal attributions about our findings. Future studies with larger, more diverse samples using a randomized controlled design should be conducted to increase generalizability and address causality. Additionally, only one third of students in the current sample reported witnessing bullying post-training. Although prior research indicates 80% of students reported witnessing bullying in the past year, our measure of bystander status was limited to witnessing bullying in the past month, as we aimed to capture witnessing bullying post-training. Future research with a longer follow-up would be useful, as the sample of bystanders would likely be larger with more time between the STAC training and follow-up assessment. Additionally, the item we used to assess bystander status was developed by one of our authors and, although it has face validity, the construct validity of the item has not yet been established. Next, Cronbach’s alphas for the Bystander Intervention Model in Bullying Questionnaire scales were lower than found in initial validation research. Additionally, although all Cronbach’s alphas were ultimately in the acceptable range, we needed to eliminate an item from the Interpret the Event as an Emergency scale to achieve adequate internal consistency. Finally, our findings were based on selfreport data, potentially leading to biased reporting. Thus, including objective measures of observable “defending” behavior would strengthen the findings. Implications The current study provides important implications for counselors related to supporting the role of bystanders in bullying prevention. First, findings add to the growing body of literature supporting the STAC intervention as an effective school-based bullying prevention program. Because 28% of middle school students report being bullied (CDC, 2020), and bullying victimization (Moore et al., 2017) and witnessing bullying (Doumas & Midgett, 2021; Midgett & Doumas, 2019) are associated with significant mental health risks, it is imperative that students are equipped with skills they can use to act as “defenders.” Middle school counselors can implement STAC as a brief, school-wide intervention through core curriculum classroom lessons as part of a school counseling curriculum.
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