Our grandson is 4 1/2 years old and he is autistic. He is very smart, but his main issues are diction and speech. We started him on Vocabulary Builder 1, 2, and 3 as a baby. The results were great, and while he still struggles with expressing himself verbally, his word understanding is remarkable and Mom and we feel that these DVD's are greatly responsible for his progress. We have started him on this 5 DVD set, and he loves them. We watch them all the time and he has already begun to talk to us about them, just like he did with the vocabulary words. I do not think we can praise these DVD's enough. It would be very difficult to duplicate the lessons and learning aids at home on an on-going basis and they are all presented in a format that our grandson loves. Thank you. These are just great.