The purpose of the current study was to investigate the effect of training behavior modification methods on mothers of children with Attention Deficit Hyperactivity Disorder (ADHD) on reducing behavior problems and ADHD symptoms in their children's. Method: The research method was quasi-experimental with pre-test and post-test design and control group. To do so, 24 mothers of children with ADHD were selected and divided into experimental and control groups (12 mothers in each group).

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... s filled the Revised Conners' Parent Rating scale (CPRS-R) and Children's Behavioral Performance at Home questionnaires. In the next step, the experimental group was instructed behavior modification methods in 9 ninety-minute sessions while the mothers in the control group went on their normal procedures. At the end of the instructional session, both groups filled out the mentioned questioners as the post-test. Covariance analysis and t test was used for analyzing data. Results: The results of the analysis of the independent t test showed that instructing behavior modification methods improved children's behavioral problems. At the same time, the analysis of covariance showed the training had decreased hyperactivity symptoms and ADHD index among the children of the experimental group, as compared to those of the control group. However, the training was shown to have no effect on attention deficit. Conclusion: In conclusion, the findings of this study suggests that behavior modification training to mothers can help them decline their children's behavioral problems.