Perceived Moral Norms in an Extended Theory of Planned Behavior in Predicting University Students' Bystander Intentions toward Relational Bullying.

Relational forms of bullying, such as social exclusion, are prevalent among students in higher education (HE) and pose challenges to the creation of a safe and inclusive learning environment for young adults. Based on research showing how bystanders in bullying incidents can counteract bullying effectively, the present study investigated the extent to which bystanders' prosocial behavioral intentions may be predicted using an extended theory of planned behavior (TPB). Students' behavioral intentions toward the physical-social exclusion of peers in a hypothetical group work setting were investigated in a sample of 419 university students in the United Kingdom. Hierarchical regression analysis showed that moral norms significantly predicted intention over and above cognitive attitude, descriptive norms, and perceived behavioral control. In contrast, emotional attitudes and injunctive norms were not significant predictors of intention. Moreover, significant weak mediation effects could be shown for moral norms as a mediator of the relationships between standard TPB predictors and intention. The present study contributes knowledge to the growing research body on applications of the TPB and on bystander intentions in bullying in HE. Implications for a development in preventive measures to foster university students' prosocial intentions toward bullying are discussed.