The present study aims to determine the effectiveness of parent management training and life skills training based on a cognitive-behavioral therapy (CBT) approach in reducing preschool children’s internalizing problems in the community center of District 11 of Tehran. This study utilizes a quasi-experimental method with a pretest-posttest control group design. The statistical population consisted of children aged 5-6 years who were enrolled in preschool in two community centers of District 11 of Tehran Municipality in the academic year 2016/2017. This preschool was selected from six community centers located in District 11 through a convenience method. The total size of the population was 75 preschoolers. For determining the sample size, 60 preschool children with higher behavioral problem scores (score ≥ 30 or T-score ≥ 60) on the Achenbach Child Behavior Checklist (CBCL, 1987) were selected from this population and randomly assigned to two control and experimental groups. Then, the experimental group was exposed to two independent variables “parent management training” and “life skills training for children”, whereas the control group received no treatment or intervention. When the training was finished, again the two groups were measured by the Child Behavior Checklist. The CBCL filled out by mothers was used to collect and assess data. After data collection and extraction, both descriptive and inferential statistics were used to analyze research data. The results showed that parent management training based on CBT and teaching life skills to preschoolers have a significant effect on the reduction of internalizing problems.
