Autism spectrum disorders are a diagnostic unit predisposing the occurrence of challenging behaviors. Depending on their frequency and severity, behavioral problems may significantly limit the developmental possibilities of people with ASD, and also significantly affect family life and the therapeutic process. Aggressive, self-injury, destructive or stereotypic behaviors require intervention based on individualized support, the basis of which should be a functional assessment.
The aim of the study was to develop and adapt the Polish version of the Question About Behavioral Function (QABF) questionnaire by Matson and Vollmer used to assess the functions of challenging behaviors.
Data was obtained from 107 people with ASD. Material was analyzed relating to 168 problem behaviors manifested by these people. To determine the psychometric properties of the tool, reliability and validity analyses were carried out with confirmatory factor analysis using the maximum likelihood method. The Fornell and Larcker method (1981) was used to estimate the convergent and differential validity.
The analysis confirmed the structure of 5-factor QABF. Composite reliability (CR) achieved values ​​at a level of 0.855 and higher. An AVE value of above 0.5 for all factors, while at the same time lower than the CR value, confirmed the convergent validity of the tool. The differential value was confirmed on the basis of the AVE and MSV values. The results obtained confirm that the analyzed tool is accurate and reliable.
QABF, in the Polish language version, is a reliable tool for assessing the behavioral functions of people with ASD. The limitations of the research are also discussed.

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