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Evaluating the effectiveness of school- and cyber-bullying intervention and prevention programmes: Two systematic and meta-analytical reviews 10.17863/CAM.63710 Gaffney, Hannah 0000000196770218 Ttofi, Maria Farrington, David This thesis examines the effectiveness of interventions to reduce school- and cyberbullying in two meta-analytical reviews. Bullying is defined as repetitive and intentional behaviours that involve children and adolescents between whom there is a distinct power imbalance. Cyberbullying is the manifestation of these behaviours through information and communications technologies (e.g., mobile phones, social media, online environments). Evaluations of school-based anti-bullying programmes designed to reduce offline and online bullying were reviewed. The school-bullying meta-analysis included 100 evaluations of anti-bullying programmes and found that overall, interventions to reduce and prevent bullying were effective. Included programmes significantly reduced school-bullying perpetration by approximately 19-20% and school-bullying victimisation by approximately 15-16%. Several intervention components (e.g., whole-school approach, anti-bullying policies, classroom rules, and informal peer involvement) were associated with greater reductions in school-bullying perpetration. Interventions that included informal peer involvement (e.g., group discussion, role play, class exercises) and information for parents (e.g., leaflets or letters) were associated with greater reductions in school-bullying victimisation. The cyberbullying meta-analysis found that interventions significantly reduced cyberbullying perpetration by approximately 10-15% and cyberbullying victimisation by approximately 14%. This thesis also provides support for a new method of assigning weight to primary studies in a meta-analysis, the Multiplicative Variance Adjustment model, and explores many avenues for future research on 'what works' in bullying intervention and prevention. University of Cambridge 2020-02-27 Thesis Doctoral eng ESRC studentship Cambridge Trust (Vice Chancellor's scholarship) Newnham College https://www.repository.cam.ac.uk/handle/1810/316597 https://www.repository.cam.ac.uk/bitstreams/64a58da4-72ec-4dc9-a124-7ed6398b3c5a/download b87270441921ae4c6da072d32ff8a65d https://www.repository.cam.ac.uk/bitstreams/134dc54c-6ca3-4a3e-8810-52de6b418317/download 353adac0d1ebdfd65ab16480263c3c87 https://www.rioxx.net/licenses/all-rights-reserved/ bullying cyberbullying meta-analysis what works evaluation anti-bullying