Afsane Shokri - Department of Psychology, Ardabil Branch, Islamic Azad University, Ardabil, Iran.
Reza Kazemi - Department of Psychology, Ardabil Branch, Islamic Azad University, Ardabil, Iran.
Mohammad Narimani - Department of Psychology, Ardabil Branch, Islamic Azad University, Ardabil, Iran.
Somayye Taklavi - Department of Psychology, Ardabil Branch, Islamic Azad University, Ardabil, Iran.

Objective: This study aimed to compare the effectiveness of the mother’s mindfulness-based cognitive therapy and cognitive emotion regulation training on externalizing disorder and self-efficacy of aggressive children.  Methods: The research method was a quasi-experimental study with a pre-test/post-test design and a control group. The study population (N=۵۴۰) included all female students in the primary schools in Namin City, Iran in ۲۰۱۸ with their mothers. A multistage clustering random sampling was used to choose the students under study, and a total of ۲۱۷ students were selected as the samples and the aggression questionnaire was completed by the teachers. Of these students, ۷۹ students who scored high on the Shahim’s aggression scale were selected as aggressive students and ۶۰ mothers of these students were selected by considering the inclusion criteria and were assigned randomly in three groups of ۲۰ mothers each. The mindfulness-based cognitive therapy and cognitive emotion regulation training were executed in the experimental groups in ۸ sessions, whereas the control group received no intervention. Before and after the intervention, all three groups responded to Shahim’s relational aggression scale, Sherer and Adam’s general self-efficacy, and Achenbach and Rescolar’s child behavior checklist. The obtained data were analyzed by multivariate analysis of covariance.  Results: The calculated values ​​showed that mindfulness-based cognitive therapy was more effective (P>۰.۰۵) than cognitive emotion regulation training. Conclusion: the findings of this study suggest that mother’s mindfulness-based cognitive therapy can be an effective intervention in reducing externalizing disorders and increasing self-efficacy in aggressive children.

Aggression, Mindfulness-Based Cognitive Therapy, Cognitive emotion regulation training, Externalizing disorders, Self-efficacy