Bullying is a phenomenon of unjustified aggression which actually takes place in two formats: face to face and as a behavior that is carried out through digital devices (cyberbullying). Both have been widely studied, though currently there is little knowledge about the homogeneity of both phenomena and we do not have measuring instruments for evaluating their two dimensions: aggression and cyber-aggression, victimization and cyber-victimization. This paper presents the validation of the European Bullying Intervention Project Questionnaire and the European Cyberbullying Intervention Project Questionnaire, that assess respectively the involvement in bullying and cyberbullying. Both have been administered to 792 high school students and have achieved good fit and good psychometric properties. The use of a structural equations modelling has allowed us to evaluate the concurrence and the relations between the two phenomena, finding the influence of bullying on cyberbullying, but not vice versa. These results show the suitability of the two instruments to assess together bullying and cyberbullying, given their important relationship and similarity, which makes them good tools for educational intervention to prevent and reduce both phenomena.
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