In the study by Anan et al. (2008),

In the study by Anan et al. (2008), the researchers trained parents in behavioral principles over the course of one 12-hr initial training workshop and subsequent 12-week training. The behavioral therapist trainers used modeling and coaching with feedback to train the parents to use intervention procedures, such as reinforcement, prompting, and behavioral momentum. Children participating in the study made gains in both language and communication, with the largest gains evidenced in the test results of the Mullen and Vineland., demonstrating that the participants made significant developmental gains at a much faster rate than demonstrated prior to the implementation of the treatment.