Functional behavior assessment and the selection of function-based interventions are best practices in the treatment of challenging behavior. However, few studies have examined the skills of psychoeducators in functional behavior assessment. In this study, 54 psychoeducators Revue de psychoéducation Volume 51, numéro 2, 2022, 407-425 analyzed ABC narrative recording and Open-Ended Functional Assessment Interview (OEFAI) transcripts to identify the function of challenging behavior in four children with autism spectrum disorders. Psychoeducators produced more accurate functions when using the OEFAI for the behavior of three children and when using the ABC recording for the behavior of one child. When we compared the conclusions of the psychoeducators with those produced by behavior analysts, four of seven comparisons indicated that behavior analysts were more accurate whereas the other three were non differentiated. Altogether, the results underline the importance of refining training in functional behavior assessment for psychoeducators.