The purpose of the study was to investigate how applied behavioral-analysisusage by parents, teachers, and psychologists, parenting education in applied-behavioralanalysis provided by schools, and collaboration among parents, teachers, and psychologists influence the behavioral, academic, social, self-help, and communicativeperformance of the children diagnosed with autism spectrum disorder. Furthermore, thisstudy examined how teachers, parents, and psychologists compare in their description ofapplied-behavioral analysis usage, parenting education in applied behavior analysisprovided by schools, and collaboration efforts about applied behavior analysis amongparents, teachers, and psychologists and their impact in the lives of children diagnosedwith autism spectrum disorder.