My nephew goes to an autism school and they use the communication books daily. Its been great. My sister will put in if he has been more sensitive than usual or when one of their cats passed away just anything for the teachers to know whats been going on outside school. In return the teachers also put in how his days at school are, if they are working on something specific, if he's been bit off at school. Whatever they feel the other needs to know the put in there.

It amazes me that teacher isn't all for it, I'd be thinking that any info about a child would be helpful so you know what ways will work better when working with them.