Tigerle, thanks for the book recommendation. I'll have a look.
Blackcat, they don't have lockers in their class. They do have a desk, where they can keep their stuff. However, I suspect that it is a very small desk, and that he can't seem to keep it organized (which leads to him unable to take things out/put things back in the proper place, when asked). I had not heard of BRIEF before, so thanks for the link.

I am also wondering out aloud if this is just an age issue -- as in, will he outgrow it (with supports, scaffolding etc) ? Or, do people who have challenges with executive function, have it for life ?