Purpose: The aim of this study was to explain the effectiveness of the model of established methods in autism (functional behavior analysis of ABA, Snowlen, and Dosa) based on the level of attention in children with autism spectrum disorder in Tehran. Methodology: The research method was quasi-experimental with a pretest-posttest design with a control group. The statistical population of this study was all children with autism spectrum disorder in Tehran in public and private educational and rehabilitation centers in 2018. By available sampling method, 48 people were selected and randomly divided into 4 intervention groups by applied behavior analysis method. , Snozelen, dosa and control group were divided. Data were collected based on the Connors Scale Scale (Parent Form) (1999), a modified review checklist, and the Wechsler intelligence test. Descriptive and inferential statistical methods and multivariate analysis of covariance were used to eliminate the pretest effect using SPSS software was used. Findings: The results showed that all three methods of functional behavior analysis of ABA, Snozlen and Dosa had a significant effect on increasing attention compared to the control group. Also, ABA applied behavior analysis method had a greater effect on improving attention in the three measurement stages than the other two experimental groups. Conclusion: The findings of the study showed that the use of these interventions and educational programs as a method in improving and rehabilitating children with this disorder is useful, so the use of this method is recommended. The results showed that the difference between the analysis of functional behavior of ABA, Snozlen and Dosa with the control group was significant at the level of 0.05, so it can be said that all three methods of functional behavior analysis of ABA, Snozlen and Dosa compared to the control group had a significant effect on increasing attention.
