The dependent t-test revealed a significant difference between the pretest-posttest aggression scores in the experimental group, but there was no significant difference in the control group. The data were subsequently examined using Analysis of Covariance(ANCOVA). The experimental group had 8 intervention sessions, whereas the control group received no intervention. The Buss-Perry Aggression Questionnaire was conducted on students. Randomly, they were assigned to an experimental(nā=ā15) and control groups(n-15). Using purposive sampling and based on include and exclude criteria (high risk of aggression due to their scores on a screening test and Parental consent to participate in the class) 30 female students were selected. ![]() In the 2019ā2020 academic year, the statistical population comprised all female students in high school first and second years in the city of Yazd, Iran. This was a quasi-experimental study, using pretest-posttest design with a control group. This study aimed to determine the effectiveness of the Positive Youth Development (PYD) program on reducing aggression among high school female students in Yazd city. This concept emphasizes that teenagers are capable of making positive changes (such as: flexibility, Responsibility, Identify abilities). ![]() The positive youth development program highlights the abilities of adolescents and young people.
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