Communication device: teaching to say “yes”
At first only ask him questions you know he would want to respond with a “yes”. After asking him the question, you will not want to use many other words until you get him to respond to your question “do you want this?”. Using too many words could be hard for him because he will have to process all those words. Remember this when you need to correct him for choosing the wrong button/ word. If he chooses wrong physically prompt him with hand over hand to the correct button and promptly give him reinforcer. Remember to fade these prompts as quickly and as much as possible. If prompts are not faded, he could become dependent on the prompts.