First published in 1984. The reissue of this manual is timely for two reasons: The dramatic increase in the incidence of autism and the use of this program with children who have autism and their parents since 1984 by one of the authors (PRZ). This manual has been used successfully to produce spontaneous three-word sentences in the majority of children in the original Boston sample (i.e., those with normal information processing ability), in clinical cases seen subsequently at the Montreal Children's Hospital until May 2002, and those treated at the Montreal Autism Centre currently. In all these cases, the manual has been used under the guidance of a professional who was skilled with these procedures, originally the three authors, two psychologists and a behavioral pediatrician/psychologist (RBK).