As a parent of an autistic boy wishing to embark on an ABA program I found this book very helpful and very clear. Its a jungle out there when it comes to choosing the best therapies to help your child, and it is very difficult to know what information is useful and trustworthy. We started with an ABA instructor who is supervised by a BCBA using the Verbal Behaviour Approach. The Verbal Behaviour approach to ABA really works as the instructor 'pairs' with the child for 3 weeks or so before trying to do some more serious learning. My son has made enourmous progress since sept 09 when we started the VB approach. Its all about motivation. Due to the approach, he LOVES his instructor and would do anything for her. This book clearly explains the jargon and methodology and is very readable.