Martin you are a hero amongst the verbally challenged my son James said hello mum to me last year at age 16yrs using eyegaze technology he has never had any way of communicating to us or anyone we was told when he was 7 that he had no level of understanding and would never communicate we always believed he understood and watching your talk a week ago I purchased your book and it has helped us to understand what it was like for james all these years he's only in early stages of communication using around 60 core vocabulary words but he is improving everyday thankyou so much for sharing your remarkable story you have given me chance to hope that james has a future :)