M.P.
I've had several students with it. PECs are helpful. Google it. Basically, it's making picture stories for him for daily routines. For eg. have a comic strip on the wall with pictures of what he does to get up and ready for school in the morning.
Pic. 1 outa bed.
Pic. 2 eat
Pic. 3 brush teeth...
and so forth. Pictures are great for that.
Does that answer your question or were you looking for something more specific?