Some autistic children cannot stand the sound of certain voices. I have come across cases where teachers tell me that certain children have problems with their voice or another person`s voice. This problem tends to be related to high-pitched ladies` voice...
Research is starting to show that a child should be engaged at least 20 hours a week. I do not think it matters which program you choose as long as it keeps the child actively engaged with the therapist, teacher, or parent for at least 20 hours a week.