One tool that has worked with our DS7 who is highly verbal but who has average PSI is to have him either dictate what he would like to write into a recorder and/or he tells us, we type it out, print it out and he writes it out. When we do the typing, he just says everything he wants to say, then he reads it and edits it and writes it. I think sometimes it is hard for him because he has so many ideas in his head, the challenge is getting it on the paper. He has a lot of writing homework this year, so I am hoping this system will help him learn the process of writing.