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This study aimed to determine the effectiveness of cognitive behavioral group therapy on depression and the rate of change of mental health of high school students. The research model of this study is quasi-experimental and is applied research due to the objective component. A research project was for two groups of experimental group and control group, with pretest and posttest. The population of this study included all high school students (male and female) in Tehran. Given that the study population was high school students, the sample of this study consisted of 30 high school students who were accidentally classified into the two groups (15 in experimental group, 15 in control group). A tool that is used in this study is Beck Depression Inventory (B.D.I) and mental health of Keys. Information collected were prepared for statistical calculations; after gathering and removing the defects at the end of it, all data collected were entered into SPSS Inferential statistics (for the difference between the experimental group and the control group) test multivariate analysis of covariance (ANCOVA) was used, the results indicate that all four hypotheses were accepted.

TO DETERMINE THE EFFECTIVENESS OF COGNITIVE BEHAVIORAL GROUP THERAPY ON THE RATE OF CHANGE IN DEPRESSION AND MENTAL HEALTH OF HIGH SCHOOL STUDENTS