Design
aggression
This was a quasi-experimental study, using pretest-posttest design with a control group. In the 2019–2020 academic year, the statistical population comprised all female students in high school first and second years in the city of Yazd, Iran. Using purposive sampling and based on including and excluding 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. Randomly, they were assigned to an experimental(n = 15) and control groups(n-15).First, an aggression questionnaire was administered to school students, and those students who were diagnosed with aggression were selected, and a semi-structured interview was also used to confirm the accuracy of the collected information. In this interview, the questions were the same for students. For example, how often do you fight with your classmates? Why do you get aggressive? A total of 154 students from four schools were included in the study and 30 students remained based on the entry and exit criteria. The inclusion criteria were Parental consent form, willingness to participate in the research, attending one of the seventh to tenth grades, obtaining a high score in aggression test, and The exclusion criteria was parents’ lack of consent.The female students in the two experimental and control groups were from 8th to 10th grade, and their average age was about 15 years. They lived with their parents. Parents did not report serious family problems. The average number of children in each family was about 2 children. The income level of the families was medium to high. They lived in the middle area of the city.Data were analyzed in SPSS 24 using descriptive statistics such as Mean and Standard Deviation and T test& ANCOVA was used to test the research hypothesis. All methods were carried out in accordance with relevant guidelines.