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The Behavioral Summarized Evaluation is a rating scale specifically related to the assessment of autistic behaviors in children and young teenagers with Autism Spectrum Disorder, such as communication, social interaction and interests. It also facilitates progressive recording of the evolution of children with ASD involved in short-term therapeutical studies. In the absence of standardized tools to assess autistic behaviors and effects of therapeutics in Lebanon, the BSE-R validation is an urgent need. The purpose of this study is to validate the BSE-R to the Lebanese population., Method: Specialized translators and clinicians ensured forward and backward translation of the scale into Arabic. The participants consisted of 100 children with ASD, diagnosed upon DSMIV-TR criterion (age range: 35 to 153 months, DS: 28.0). Fifty-eight had intellectual disability (ID). Scores of autism severity as measured by CARS1 (Schopler et al., 1980) varied from 20-58.5. Trained raters on recorded individual and group situations performed BSE-R ratings., Results: BSE-R for Lebanese was found to have excellent inter-rater reliability. The internal validity highlighted a main factor which describes the severity of core autistic behaviors related to social interactions and communication, and behavioral specificities and particular interests with an internal consistency of 0.91 in a one-to-one setting and 0.92 in group settings. External validity of the scale as measured by correlations with CARS and the age of the children showed that this main factor is essentially determined by ASD severity, not by the severity of ID. It was named "relational deficiency" according to the initial paper of Barthélémy et al. (1997)., Conclusion: BSE-R in Arabic is a practical tool, useful to all team members working with ASD children in Lebanon and the Arab countries. It will also allow future research based on reliable tools at an international level., (Copyright © 2016 L’Encéphale, Paris. Published by Elsevier Masson SAS. All rights reserved.)