Of the myriad of approaches to the treatment of autism spectrum disorders, Applied Behaviour Analysis (ABA) has the most research support. It is not perfect, and its imperfection is highlighted by the inadequate training of many if not most of its practitioners. Autism is a burgeoning condition - in some locations it is estimated to effect one in every seventy-five children - and the numbers of instructor-therapists required to meet their need for treatment is ensuring that many enter the field with inadequate training. Of course, lack of training is not unique to practitioners of ABA; the...