| Summary: | Bullying at school has become a important social issue, because it has a negative
impact on psychological and social adjustment of student, (Ttofi & Farrington,
2008). The result of initial survey by researchers on July-August 2013 to 739
student of senior highschool in Yogyakarta, explained that 13,53% had
experienced bullying and 53,58% students had seen bullying at school.
Preventive programs by peers is one of the efforts that can be done to prevent
bullying at school. The purpose of this study is pilot training modules to improve
skills of peer facilitator through case discussions method, in delivering
antibullying information. The design of research used untreated control group
design with pre�post test (Shadish, Cook, Campbell, 2002). Quantitative data
analysis using non-parametric statistical Mann-Whitney U test by analyzing gain
scores. Results of analysis shows there�s a significant skills difference in gain
score between experiment group than control group. It means that hypothesis
accepted, Z= -4,172 and significant p=0,001 (p<0,01)
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